Most metals are metallic grey or silvery white whereas gold is characteristically a metallic yellow colour, in other words gold-coloured. Caesium is also gold coloured. The gold colour seems related to relativistic effects of the outermost gold orbitals.
Small amounts of other metals alloyed with gold change the colour as well as mechanical properties such as hardness. White gold for jewellery is formed by mixing palladium, silver, or nickel with gold, although the result is green gold with certain proportions of silver. White gold is commonly used for wedding rings in the USA. Addition of some copper gives "rose gold", a soft pink colour. Remarkably other colours such as purple (a gold:aluminium alloy), blue (a gold:indium alloy) and even black (a gold:cobalt alloy) may be formed.
Gold is usually alloyed in jewellery to give it more strength, and the term carat describes the amount of gold present (24 carats is pure gold). It is estimated that all the gold in the world, so far refined, could be placed in a single cube 60 ft. on a side. It is metallic, with a yellow colour when in a mass, but when finely divided it may be black, ruby, or purple.
It is the most malleable and ductile metal; 1 ounce (28 g) of gold can be beaten out to 300 square feet. It is a soft metal and is usually alloyed to give it more strength. It is a good conductor of heat and electricity, and is unaffected by air and most reagents.
Gold is readily available commercially and its price changes day by day and is one of the most widely tracked commercial prices.
The most common gold compounds are auric chloride (AuCl3) and chlorauric acid (HAuCl4). A mixture of one part nitric acid with three of hydrochloric acid is called aqua regia (because it dissolved gold, the King of Metals). It is unaffected by air and most reagents. It is found free in nature and associated with quartz, pyrite and other minerals. Two thirds of the world's supply comes from South Africa, and 2/3 of USA production is from South Dakota and Nevada. Gold is found in sea water, but no effective economic process has been designed (yet) to extract it from this source.
Gold Assay
It is critical from the public's perspective that there is confidence in the claimed purity of any particular item made from precious metals. This confidence is provided by an 'assay' (test and assess) of the precious metal content of that item. It is impossible to tell the precious metal content of any item simply by looking at it. Precious metals such as old, silver, and platinum are too soft to use alone for making jewellery, cutlery and other goods. Quite properly they must be alloyed with base metals (which happen to be cheap) for manufacturing. The assay protects the consumer by ensuring sure that not too much base metal was used. It also safeguards responsible manufacturers by providing an independent assessment of quality and content that in which the public has confidence.
There has been an "Assay Office" at Sheffield in England since 1773 when local silversmiths won the right from Parliament to assay silver in Sheffield. The 1773 Act of Parliament appointed 30 local men as 'Guardians of the Standard of Wrought Plate in the Town of Sheffield' to supervise the work of the Office. In 1773 Sheffield already had an established tradition of fine silverware production and the number of Guardians who were also silversmiths was restricted to just ten to ensure that the Assay Office offered an independent and impartial service. This safeguard was to ensure the Office was run for the benefit of the consumer as well as the manufacturer. Once a piece was assayed, it was marked using a "hallmark", making the hallmark perhaps the oldest mark of consumer protection. The first UK Assay Office was and is based at Goldsmiths' Hall in London. It founded around 1300, and is from where the term "hallmarking" originates, meaning "marked in Goldsmiths' Hall".
While there are assay offices in the USA, there is no hallmarking scheme.
Cartoon by Nick D Kim ([Science and Ink], used by permission).
Gold: physical properties
- Density of solid: 19300kg m-3
- Molar volume: 10.21cm3
- Thermal conductivity: 320Wm‑1K‑1
More physical properties...
Gold: heat properties
- Melting point: 1337.33 [1064.18°C (1947.52°F)]K
- Boiling point: 3129 [2856°C (5173°F)]K
- Enthalpy of fusion: 20.5kJ mol-1
More thermochemical properties...
Gold: atom sizes
- Atomic radius (empirical): 135pm
- Molecular single bond covalent radius: 124 (coordination number 2)ppm
- van der Waals radius: 245ppm
More atomc size properties...
Gold: electronegativities
- Pauling electronegativity: 2.54 (Pauling units)
- Allred Rochow electronegativity: 1.42 (Pauling units)
- Mulliken-Jaffe electronegativity: 1.87 (s orbital)
More electronegativity properties...
Gold: orbital properties
- First ionisation energy: 890.13kJmol‑1
- Second ionisation energy: 1949.3kJmol‑1
- Third ionisation energy: 2890kJmol‑1
More orbital properties...
Gold: abundances
- Universe: 0.6ppb by weight
- Crustal rocks: 3.1ppb by weight
- Human: 100ppb by weight
More geological data...
Gold: crystal structure
More crystallographic data...
Gold: biological data
- Human abundance by weight: 100ppb by weight
Gold is not a necessary trace element for living things and neither are any of the other third row d-block elements. In part this may be because there is little gold in the biosphere with which living things might experiment and also because there are few ways for living things to convert gold into a suitable soluble form. There do seem to be a few plants that accumulate gold, perhaps because they are associated with microorganisms containing particular amino acids that complex gold.
Given the fascination of people for gold it is not surprising that people experimented with gold for medical treatments. In the 8th century alchemists attempted to prepare elixirs from metallic gold. These were supposed to cure all diseases as well as conferring eternal youth. In the 13th century gold was disolved in aqua regia and the resultant mixture mixed with oil of rosemary or other "essential oils" to form aurum potabile. This was said to cure leprosy. Following this gold treatments were often often used for any number of conditions but with little evidence that they actually worked. Things started to get a little more interesting in the 1890s when it was found that the gold cyanide salt K[Au(CN)2] killed the microorganism responsible for tuberculosis. This was used to treat tuberculosis but, perhaps unsurprisingly, with considerable toxicity problems.
After the first world war gold thiol drugs were developed. These are Au(I) complexes such as sodium aurothiosulphate ("Sanocrysin"), sodium aurothiomalate ("Myocrisin"), and aurothioglucose ("Solganal-B-oleosum"). These are less toxic than K[Au(CN)2] but eventually fell out of favour. However sodium aurothiosulphate and aurothioglucose ("Solganal-B-oleosum") are in use today for the treatment of rheumatoid arthritis following successful drug trials. Some patients do suffer side effects.
More recently gold phosphine complexes of the type [AuX(PR3)] (X = halide, R = alkyl) were tested for anti-inflammatory effects. They possess the advantage that they may be taken orally whereas earlier drugs such as sodium aurothiomalate must be injected. The gold phosphine drugs seem less toxic to the kidneys and the best therapeutic effect is observed for [AuCl(PEt3)].
Auranofin (brand name Ridaura) is an organogold compound classified by the World Health Organization as an antirheumatic agent.IUPAC Name: gold(1+); 3,4,5-triacetyloxy-6-(acetyloxymethyl)oxane-2-thiolate;triethylphosphaniumCanonical SMILES: CC[PH+](CC)CC.CC(=O)OCC1C(C(C(C(O1)[S-])OC(=O)C)OC(=O)C)OC(=O)C.[Au+]InChI: InChI=1S/C14H20O9S.C6H15P.Au/c1-6(15)19-5-10-11(20-7(2)16)12(21-8(3)17)13(14(24)23-10)22-9(4)18;1-4-7(5-2)6-3;/h10-14,24H,5H2,1-4H3;4-6H2,1-3H3;/q;;+1
Other drugs that perhaps have anti-inflammatory effects include Au{(SCH(CH2CO2H)(CO2H)}(PR3)] (R = alkyl, alkoxy, phenyl).
The gold isotope 198Au is used for treating cancer and other conditions.
Further reading:
Peter J. Sadler, "The biological chemistry of gold", Gold Bulletin, 1976, 9, 110-118.
Sabine L Best and Peter J. Sadler, "Gold Drugs: Mechanism of Action and Toxicity", Gold Bulletin, 1996, 29, 87-93.
More biological data...
Gold: uses
Uses...
Gold: reactions
Reactions of gold as the element with air, water, halogens, acids, and bases where known.
View reactions of gold...
Gold: binary compounds
Binary compounds with halogens (known as halides), oxygen (known as oxides), hydrogen (known as hydrides), and other compounds of gold where known.
View binary compounds...
Gold: compound properties
Bond strengths; lattice energies of gold halides, hydrides, oxides (where known); and reduction potentials where known.
View compound properties...
Gold: history
Gold was discovered by known since ancient times in unknown at not known. Origin of name: from the Anglo-Saxon word "gold" (the origin of the symbol Au is the Latin word "aurum" meaning "gold").
More history...
Gold: isotopes
Gold is monoisotopic consisting completely of 197Au. However there are a number of radioisotopes, some of which are listed.
The gold isotope 198Au is used for treating cancer and other conditions. In the form of a gold colloid, 198Au has a diagnostic use for liver imaging and a therapeutic use in treatment of widespread abdominal carcinomatosis with ascites; carcinomatosis of pleura with effusion; lymphomas; interstitially in metastatic tumour. While there is a certain risk from the β-decay of 198Au the calculation is that the benefits outweight the risks.
More isotope and NMR data...
Gold: isolation
Isolation: it would not normally be necessary to make gold in the laboratory as it is readily available commercially. The most romantic way to extract gold is by panning it out from a stream in some pleasant valley but most such sources are now depleted. Panning relies upon the density of gold (which is very high) being much greater than that of the sand and other particulates. It therefore settles to the bottom of the pan. The amount of gold recoverable in this way is declining.
One suggestion regarding the golden fleece in the Jason and the Argonauts story (Greek mythology) is that the golden fleece is a consequence of gold mining. There are suggestions that, perhaps 1500 years ago sheep fleeces were stretched out over wooden frames and be submerged in streams. Gold particles swept down from from upstream deposits would then become embedded in them. The fleeces were then dried in trees before shaking or combing the gold out. Similarly, sheep fleeces may have been used on washing tables at alluvial gold mines with much the same effect. Perhaps such methods predated panning of gold from river sands.
Today, more often than not, gold is extracted from ores. These ores often contain relatively little gold. Some of these processes cause environmental concern. Much gold is recovered from ores that are low in gold concentration using a cyanide extraction process. Cyanide extraction was first used around 1887, when the MacArthur-Forrest Process was developed in Glasgow by John Stewart MacArthur. Many worry about the envoronmental effects of the cyanide extraction process and the risks of using cyanide on a large scale. There are three main steps.
The first step is leaching - the ore is crushed to a powder so as to expose the small gold particles. and mixed with water. The resulting mixture of powdered ore and water (the slury) is then reacted with cyanide in the presence of oxygen.
4Au(s) + 8CN-(aq) + 2H2O(l) + O2(g) → 4[Au(CN)2]-(aq) + 4OH-(aq)
The result is that electrons from oxygen are used to convert the gold metal into a Au(I) complex, [Au(CN)2]-. The acidity of the process must be slightly alkaline (pH 10.1 for instance) to minimise the release of highly toxic hydrogen cyanide while optimising the leaching rate.
The next stage is concentration. Once in solution the gold must be converted back to gold metal. One way to do this is by adsorption of the gold onto activated carbon. Most of the impurities are left behind in the solution. This would appear to cause some anion exchange of [Au(CN)2]- with anions associated with the carbon, the precipitation of insoluble AuCN, and the formation of some metallic gold within the carbon pore structure.
The final step is recovery and refining. Gold is stripped from the carbon by mixing it with NaCN and NaOH at 1108C forming a new solution of [Au(CN)2]-. This solution is now fairly pure as the activated carbon process removes many of the impurities. The gold is then converted back to elemental gold in the following electrolysis reactions known as "electrowinning":
At the anode:4OH-→O2+2H2O+4e-
At the cathode:e-+ [Au(CN)2]- →Au+2CN-
Overall: 4OH- + 4[Au(CN)2]- → 4Au + 8CN- + O2 + 2H2O
The gold is "won" onto stainless steel electrodes or precipitated out as a fine black mud. The mud is then smelted and poured into moulds to make gold ingots.
As an laternative to this, zinc powder is added to the solution or reasonably pure of [Au(CN)2]-. This results in a metal displacement reaction:
2[Au(CN)2]-(aq) + Zn(s) -> [Zn(CN)4]2-(aq) + 2Au(s)
As before a fine black 'mud' of gold and residual zinc precipitates from the solution, which is then smelted.
Extraction of gold from seawater
There is some gold in seawater, but the concentration of dissolved gold is very low, perhaps 10 ng l-1. The most determined attempt to recover gold from sea water was undertaken by Fritz Haber, [F. Haber, Z. Angew. Chem. 1927, 40, 303.], who researched the matter extensively after the First World War. He wanted to find a way to pay Germany's war reparation debts. He developed a method involving gold reduction to the metal by sodium polysulfide and removal using sulphur-coated sand filters. Four expeditions were made on ships equipped with the extraction technology but with disappointing results. Following this Haber estimated the gold concentration in sea water to be 4 ng l-1, just one-thousandth of the amount which he had expected.
With the current estimate for the concentration of gold in sea water as 10 ng-1 and the total volume of the oceans at 1.37 x 109 km3, then the total quantity of gold dissolved in sea water is calculated to be 13.7 million tons. A lot of gold, but not extractable on a commercial basis as yet.
FAQs
What is the elements for gold? ›
Gold is element 79 and its symbol is Au. Though the name is Anglo Saxon, gold originated from the Latin Aurum, or shining dawn, and previously from the Greek. It's abundance in the earth's crust is 0.004 ppm. 100% of gold found naturally is isotope Au-197.
What are the essential components of the periodic table? ›The essential mineral elements are: Nitrogen, phosphorus, potassium, calcium, magnesium, sulfur, boron, chlorine, iron, manganese, zinc, copper, molybdenum, and nickel.
What is the symbol for gold on the periodic table? ›Gold is a chemical element with the symbol Au (from Latin: aurum) and atomic number 79. This makes it one of the higher atomic number elements that occur naturally. It is a bright, slightly orange-yellow, dense, soft, malleable, and ductile metal in a pure form.
What are 5 facts about gold? ›- Gold Comes from Meteorites. Nearly all the world's gold came from meteorites that bombarded the planet over 200 million years after it formed. ...
- Gold Is Malleable. ...
- Gold Is Alloyed With Other Metals. ...
- Gold Is Yellow. ...
- Gold Is Ductile. ...
- Gold Is Nontoxic. ...
- Gold Is Pliable. ...
- Gold Is Dense.
- Gold conducts heat and electricity. ...
- Gold is ductile: It can be drawn out into the thinnest wire. ...
- Gold is highly reflective of heat and light. ...
- Gold is prized for its beauty. ...
- Gold is malleable, so it can be flattened into extremely thin sheets.
The essential mineral elements are: Nitrogen, phosphorus, potassium, calcium, magnesium, sulfur, boron, chlorine, iron, manganese, zinc, copper, molybdenum, and nickel.
What are the 11 essential elements? ›The human body is approximately 99% comprised of just six elements: Oxygen, hydrogen, nitrogen, carbon, calcium, and phosphorus. Another five elements make up about 0.85% of the remaining mass: sulfur, potassium, sodium, chlorine, and magnesium. All of these 11 elements are essential elements.
What are the 20 essential elements? ›Lithium, Beryllium, Sodium, Magnesium, Aluminium, Potassium, and Calcium are metals in the first twenty elements. Hydrogen, Helium, Carbon, Nitrogen, Oxygen, Fluorine, Neon, Phosphorous, Sulphur, Chlorine, and Argon are the non-metals in the first twenty elements.
What is a group of gold called? ›Group 11, by modern IUPAC numbering, is a group of chemical elements in the periodic table, consisting of copper (Cu), silver (Ag), and gold (Au), and roentgenium (Rg), although no chemical experiments have yet been carried out to confirm that roentgenium behaves like the heavier homologue to gold.
Why is gold called gold? ›“Gold” derives from the Proto-Germanic gulþą, which comes from the Proto-Indo-European ǵʰelh₃-. The Proto-Indo-European word means “to shine, to gleam; to be yellow.” Gold is the only naturally yellow metal, so ancient civilizations named it after its stunning color.
Why is gold valuable on the periodic table? ›
Gold does not dissipate into the atmosphere, it does not burst into flames, and it does not poison or irradiate the holder. It is rare enough to make it difficult to overproduce and malleable to mint into coins, bars, and bricks. Civilizations have consistently used gold as a material of value.
What are 3 unusual facts about gold? ›- 11.2 million – If all of the existing gold in the world was pulled into a 5 micron thick wire, it could wrap around the world 11.2 million times.
- 2808 degrees centigrade - The boiling point of gold is 2808 degrees centigrade.
- 31.103 grams– There are just over 31 grams in a troy ounce of gold.
An adult human body weighing 70 kg contains about 0.2 milligrams of gold. It's been found that the element plays an important health function, helping to maintain our joints, as well as facilitating the transmittal of electrical signals throughout the body.
Does gold stick to magnet? ›If it's real gold it will not stick to the magnet. (Fun fact: Real gold is not magnetic.) Fake gold, on the other hand, will stick to the magnet. If that necklace leaps to the magnet, your significant other has some explaining to do.
What are the 10 properties of gold? ›- Density : 19,300 kg per cubic metre.
- Melting point : 1337.33 K (1064.18 °C).
- Boiling point : 3129 K (2856 °C).
- Atomic number : 79.
- Nucleic protons : 79.
- Atomic weight : 197.
- Nucleic neutrons (normal) : 118.
- Currency & Investment. Gold is rare and highly valued and has been in use as currency all around the globe for thousands of years. ...
- Jewellery. The majority of gold consumed each year comes from the jewellery trade. ...
- Electronics. ...
- Dentistry. ...
- Medicine. ...
- Computers. ...
- Aerospace. ...
- Gold Leaf.
When fine jewelry shopping, you'll often notice each jewelry piece is available in three metal color options: Yellow, White, and Rose Gold. They usually cost the same price, but these three types of gold vary in both appearance and chemical composition.
What are 17 essential elements? ›The 17 Essential Plant Elements include nitrogen, phosphorus, potassium, calcium, magnesium, sulfur, boron, chlorine, iron, manganese, zinc, copper, molybdenum, and nickel. The non-mineral essential plant elements include hydrogen, oxygen, and carbon. These are either taken up as a gas or water.
What is the 16 essential elements? ›Sixteen elements are considered essential nutrients for plants. These are carbon (C), oxygen (O), hydrogen (H), nitrogen (N), phosphorus (P), potassium (K), calcium (Ca), magnesium (Mg), sulfur (S), iron (Fe), manganese (Mn), zinc (Zn), copper (Cu), boron (B), molybdenum (Mo) and chlorine (Cl).
What are the 21 essential elements? ›Calcium, carbon, chlorine, cobalt, copper, fluorine, hydrogen, iodine, iron, magnesium, manganese, molybdenum, nitrogen, oxygen, phosphorus, potassium, selenium, sodium, sulfur, and zinc are regarded as the 21 elements essential for life.
What are the 7 elements essential to all life? ›
The new catalog includes all of the so-called “CHNOPS elements” – carbon, hydrogen, nitrogen, oxygen, phosphorous, and sulfur – known to be the building blocks of all life on Earth.
What are the 10 essential elements for life? ›Living organisms contain relatively large amounts of oxygen, carbon, hydrogen, nitrogen, and sulfur (these five elements are known as the bulk elements), along with sodium, magnesium, potassium, calcium, chlorine, and phosphorus (these six elements are known as macrominerals).
What are the 5 most important elements? ›1. Note that most living matter consists primarily of the so-called bulk elements: oxygen, carbon, hydrogen, nitrogen, and sulfur—the building blocks of the compounds that constitute our organs and muscles. These five elements also constitute the bulk of our diet; tens of grams per day are required for humans.
What are the 4 main elements of life? ›Scientists believe that about 25 of the known elements are essential to life. Just four of these – carbon (C), oxygen (O), hydrogen (H) and nitrogen (N) – make up about 96% of the human body.
Which element is most essential? ›Air is the most essential element of life as it contains oxygen which is responsible for life-sustaining on the earth.
What color is gold? ›The American Heritage Dictionary defines the color metallic gold as "A light olive-brown to dark yellow, or a moderate, strong to vivid yellow." Of course, the visual sensation usually associated with the metal gold is its metallic shine.
What's a brick of gold called? ›A gold bar, also called gold bullion or gold ingot, is a quantity of refined metallic gold of any shape that is made by a bar producer meeting standard conditions of manufacture, labeling, and record keeping. Larger gold bars that are produced by pouring the molten metal into molds are called ingots.
What creates gold? ›Gold minerals form in hot rocks in and around volcanoes. Low sulfur, gold-bearing hydrothermal fluids form when hot rocks heat ground water. An example of these low-sulfur fluids are hot springs like those at Yellowstone National Park. The ores of Round Mountain, Nevada, are typical low-sulfur deposits.
Why is gold a rare metal? ›Gold is rare throughout the Universe because it's a relatively hefty atom, consisting of 79 protons and 118 neutrons. That makes it hard to produce, even in the incredible heat and pressure of the 'chemical forges' of supernovae, the deaths of giant stars responsible for creating most chemical elements.
Who invented gold? ›Gold Discovery in Egypt
An Egyptian alchemist named Zosimos was the first to find pure gold (24 centuries before Columbus reached the Americas). The discovery of gold is attributed to the ancient Egyptians, who made jewelry out of gold. It was at a time when other metals were scarce and valuable.
Who created gold? ›
Scientists believe all the gold on Earth formed in supernovae and neutron star collisions that occurred before the solar system formed. In these events, gold formed during the r-process. Gold sank to the Earth's core during the planet's formation. It's only accessible today because of asteroid bombardment.
Is gold the most useful metal? ›Gold is one of the most highly-desired and useful metals in the world. Not only can it be beautifully shaped and sculpted, the precious yellow metal conducts electricity and does not tarnish. These qualities make it the metal of choice for the industrial, medical and technology industries, just to name a few.
What is the real value of gold? ›Real Gold Price in US Dollars is at a current level of 640.16, up from 587.24 the previous market day and up from 635.28 one year ago. This is a change of 9.01% from the previous market day and 0.77% from one year ago.
What are the 11 elements of gold? ›| Z | Element | No. of electrons/shell |
|---|---|---|
| 29 | copper | 2, 8, 18, 1 |
| 47 | silver | 2, 8, 18, 18, 1 |
| 79 | gold | 2, 8, 18, 32, 18, 1 |
| 111 | roentgenium | 2, 8, 18, 32, 32, 17, 2 (predicted) |
Gold is a noble metal and falls into the transitional metal family on the periodic table in group number 11.
Is gold a mixture of elements? ›Answer and Explanation: Gold (Au) is an element whose atomic number is 79, so gold is classified as a pure substance because elements are composed only of the atoms of the same element (or are composed of the same type of particles) and are considered pure substances.
Is 14k gold an element? ›Answer and Explanation: A 14 karat gold is an example of an alloy-- metallic mixtures composed of two or more metals.
What are the 24 parts of gold? ›A gold karat is 1/24 part, or 4.1667 percent, of the whole, and the purity of a gold alloy is expressed as the number of these parts of gold it contains. Thus, an object that contains 16 parts gold and 8 parts alloying metal is 16-karat gold, and pure gold is 24-karat gold.
What is the importance of gold element? ›Gold is a good conductor of heat and electricity and does not tarnish when it is exposed to the air, so it can be used to make electrical connectors and printed circuit boards. Gold is also a good reflector of infrared radiation and can be used to help shield spacecraft and skyscrapers from the sun's heat.
Is gold a fire element? ›Fire is one of the four classical elements along with earth, water and air in ancient Greek philosophy and science. Fire is considered to be both hot and dry and, according to Plato, is associated with the tetrahedron.
What makes gold special? ›
Gold has several qualities that have made it exceptionally valuable throughout history. It is attractive in colour and brightness, durable to the point of virtual indestructibility, highly malleable, and usually found in nature in a comparatively pure form.
Why is gold so rare? ›Gold is rare throughout the Universe because it's a relatively hefty atom, consisting of 79 protons and 118 neutrons. That makes it hard to produce, even in the incredible heat and pressure of the 'chemical forges' of supernovae, the deaths of giant stars responsible for creating most chemical elements.
Does 100% pure gold exist? ›The gold standard for purity is 24K gold jewelry, which is 100% gold content. 24k pure gold jewelry does not tarnish, corrode, or rust; thus, it is the most expensive gold. However, this type of gold is much softer (scratches easily) and more malleable than other gold types.
What attracts gold? ›...
Properties of Gold:
- It's atomic number is 79- so it has 79 electrons.
- It is soft and malleable.
- It is one of the least reactive chemical elements.
- It is resistant to most acids.
- It dissolves in alkaline and mercury.
Gold is primarily found as the pure, native metal. Sylvanite and calaverite are gold-bearing minerals. Gold is usually found embedded in quartz veins, or placer stream gravel. It is mined in South Africa, the USA (Nevada, Alaska), Russia, Australia and Canada.
How much is gold worth? ›The current month is updated on an hourly basis with today's latest value. The current price of gold as of March 03, 2023 is $1,855.33 per ounce.
How much is 18K gold worth? ›...
Today's Gold Prices.
| Per Gram | |
|---|---|
| 10K | $23.75 |
| 14K | $32.92 |
| 18K | $42.72 |