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As a measure of purity, one carat is 24 purity by mass. Therefore we have X=24 Mg/Mm, where X is the carat rating of the material, Mg is the mass of pure gold in the material, and Mm is the total mass of the material. As such, 24-carat gold is  99.9% fine gold, 21-carat gold is .875 gold, 18-carat gold is 75% gold, 14-carat gold is .585% gold, 12-carat gold is 50% gold, 10-carat gold is .417% gold, 9-carat gold is .375% gold and 8-carat gold is .333% gold.


If you are up to it, you can determine the purity of your gold at home by using a popular method of relative accuracy.  This test requires a set of testing needles with different tips of exact karat, a testing stone and some acids.

Rub a small piece of  your item on the test stone andn leave a visible deposit.  Select the needle that is the nearest to the karat value you believe the gold to be and rub it on the test stone, leaving a visible mark next to your first deposit.  Leave a drop of the acid approximating theh karat that you believe your item to be.


When the two marks react the same way to the acid, then you will know that the gold content (karat value/purity) of your test sample is the same as that of the needle.

When your test sample mark reacts sooner than your needle mark, your test sample has a lower gold content.

When your needle mark reacts sooner than your test sample mark, your test sample has a higher karat value.  You can repeat these trials until you are able to find a close approximation of the karat of the gold item being examined.

When your test proves that your sample has no reaction to the acid, this will reveal that your sample is of higher karat than the acid.  In this case you can test again, using a higher test needle and acid until there is a reaction.  This way the karat of the gold item can be determined to a closer approximation.

Pre-mixed acids come in easy-to-use plastic bottles that are entirely secure, and come with color-coded caps.  You can use these acid tests on jewelry that has been properly filed to reveal the base metal (if any). The pre-mixed acids can be used for 10K, 14K, 18K and 22K gold.


Republic gold will buy the following gold items of interest after testing same for purity:  gold, gold scrap, gold chains, gold rings, gold bracelets, broken gold chains, broken gold earrings, gold fillings, gold coins, gold ingots, gold bars, gold jewelry and all other gold items you may be interested in selling. 


For centuries, buying gold has been recognized as one of the best ways to preserve one's wealth and purchasing power. Gold is a unique investment, one that has served mankind well for thousands of years. From the times of ancient Egyptians, Greeks and Romans to more modern times, man has been fascinated with the beauty and magic of gold, and with its power to change men's lives.

It is a store of value and a safe haven in times of crisis. Gold is rare, universally accepted, and can be easily bought and sold around the world. It is used in coinage and is a standard for monetary systems in many countries.

Most gold that is fabricated today goes into the manufacture of jewelry. However, because of its superior electrical conductivity and resistance to corrosion and other desirable combinations of physical and chemical properties, gold also emerged in the late 20th century as an essential industrial metal.

Gold performs critical functions in computers, communications equipment, spacecraft, jet aircraft engines, and a host of other products. Although gold is important to industry and the arts, it also retains a unique status among all commodities as a long-term store of value.


A gold coin is a flat, disc-shaped piece of gold that has been minted and issued by a government or private organization. Although gold has been recognized as a store of value virtually since the dawn of history, the first gold coins are believed to have been minted in 670 B.C. by King Gyges of Lydia in Turkey. The legendary King Croesus minted 98% pure gold coins in 550 B.C.

Half a millennium later, Julius Caesar minted gold coins to pay the Roman Legions. Somewhat apprehensive at first, the soldiers were happy to discover that the value of the gold in the coins rapidly surpassed their face value.

For gold coin collectors as opposed to bullion ownership, many factors determine the value of a gold coin, such as its rarity, age, condition and the number originally minted. Gold coins, especially pre-1933 gold coins minted in the U. S. and Europe, are rapidly becoming the asset of choice among investors worldwide.


A Gold Bar is defined as any gold item, regardless of shape, which is made by a bar manufacturer, records the name of the manufacturer, the precise weight and the precise purity, and is sold at a low premium above the gold price.

Gold bars are classified into two different typescast and minted, based on their method of manufacturing. Cast bars are made by pouring molten gold into an ingot mold to help the gold to take a form. Minted bars are made from gold blanks that have been hand cut to the required dimensions from a flat piece of gold. Markings are almost always applied by presses. ChipGold is a relatively new form of gold bar consisting of a small ingot 1-20 grams in a sealed and certified package the size of a credit card.

Gold bars are produced in a wide variety of sizes, shape, and fineness, most of them destined for one-way transit to manufacturing end-users who intend to refabricate the gold into other forms such as industrial/electronic plating or decorative applications. Most gold bars are not intended for use as investment products (i.e., recirculated on the secondary public market) primarily because their authentic weight and purity both fall into question owing to the ease of tamperability once the bars have traveled outside of the original commercial chain of custody.

U.S. residents can buy gold bullion and sell gold bullion bars and gold coins cost-effectively, directly and privately. There is no reporting when you buy gold bullion. However, be aware of cash transaction reporting rules.