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24-carat gold is pure (while 100% purity is very difficult to attain, 24-carat as a designation is permitted in commerce for a minimum of 99.95% purity), 18-carat gold is 18 parts gold, 6 parts another metal (forming an alloy with 75% gold), 12-carat gold is 12 parts gold (12 parts another metal), and so forth. [20]
The BIS system of hallmarking of gold jewellery began in April 2000. The standard specifications governing this system are IS 1417 (grades of gold and gold alloys, jewellery/artefacts), IS 1418 (assaying of gold in gold bullion, gold alloys and gold jewellery/artefacts), IS 2790 (guidelines for manufacture of 14, 18 and 22 carat gold alloys only ), IS 3095 (gold solders for use in manufacture ...
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From the schedule, it can be seen that roughly 64% of the gold bars at Fort Knox have a fineness between 899 and 901, 2% have a fineness between 901.1 and 915.4, 17% have a fineness between 915.5 and 917, and 17% have a fineness greater than or equal to 995. The average fineness is 916.7. [51] [52]
Colored gold is the name given to any gold that has been treated using techniques to change its natural color. Pure gold is slightly reddish yellow in color, [2] but colored gold can come in a variety of different colors by alloying it with different elements. Colored golds can be classified in three groups: [3]: 118
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For example, 14-karat (58.33%) gold was named "56-zolotnik gold" in Russia. As one karat means 1/24, one zolotnik is 1/4 karat. 91 zolotnik Russian silver has a millesimal fineness of 947.9. 88 zolotnik has a fineness of 916.6. It contains 91.66% pure silver. 84 zolotnik is the most common fineness of 875. [1]
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