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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.
Ternary plot of different colors of Ag–Au–Cu alloys [1]. 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.
In the case of fire assaying of gold and platinum ores, the lengthy time required to carry out an assay is generally offset by carrying out large numbers of assays simultaneously, and a typical laboratory will be equipped with several fusion and cupellation furnaces, each capable of taking multiple samples, so that several hundred analyses per ...
Carat is a weight measurement used for gems. Karat is a measure of purity used for metals (most common is gold.) As far as the measure of purity is concerned the system is based upon a total of 24 parts i.e. 24K gold is pure gold, 18K is 18parts gold 6 parts other metals (which form an alloy) and so on.... 20:45, 18 September 2007 (UTC)
Gold, a chemical element; Genomes OnLine Database; Global-scale Observations of the Limb and Disk, a NASA Explorer Mission of Opportunity; GOLD (parser), an open-source parser-generator of BNF-based grammars; Graduates of the Last Decade, an Institute of Electrical and Electronics Engineers program to garner more university level student members
The piece is made out of "18k gold and platinum set with 137 round diamonds", and its "interlocking Cs derive from the cipher of Diana, Roman goddess of the hunt". [112] The Princess also wore a pair of earrings at the event, known as Diana Earclips and made out of "mabé pearl, diamond, platinum and 18k yellow gold".
Cartier has offered the Love bracelet in 18k yellow gold, 18k "pink" (rose) gold, 18k white gold, and in platinum. Platinum has since been discontinued. Some bracelets are offered with diamonds in place of or in rotation with the screw-motif. Ceramic details and special colored precious gems have been offered as well.
The Day-Date is one of Rolex's models made only in solid 18k yellow gold, 18k white gold, 18k everose gold (Rolex's version of 18k rose gold), and platinum (PT950). [ 3 ] [ citation needed ] It also is the only model offered with the "President" bracelet in matching precious metals.