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  2. Gemstone - Wikipedia

    en.wikipedia.org/wiki/Gemstone

    A few gemstones are used as gems in the crystal or other forms in which they are found. Most, however, are cut and polished for usage as jewelry. The two main classifications are as follows: Stones cut as smooth, dome-shaped stones called cabochons or simply cab. These have been a popular shape since ancient time and is more durable than ...

  3. Kimberley Process Certification Scheme - Wikipedia

    en.wikipedia.org/wiki/Kimberley_Process...

    These are also sorted by HTS codes for unsorted (gem and industrial) rough diamonds, sorted rough industrial diamonds, and sorted rough gem diamonds – the latter of which is most likely to be polished into finished stones and jewelry for retail sale, while industrial diamonds are most likely to be used in cutting and drilling tools. Failure ...

  4. Cabochon - Wikipedia

    en.wikipedia.org/wiki/Cabochon

    A cabochon (/ ˈ k æ b u ʃ ɒ n /; from Middle French caboche 'head') is a gemstone that has been shaped and polished, as opposed to faceted. The resulting form is usually a convex (rounded) obverse with a flat reverse. [1] Cabochon was the default method of preparing gemstones before gemstone cutting developed. [2]

  5. Jet (gemstone) - Wikipedia

    en.wikipedia.org/wiki/Jet_(gemstone)

    Jet is a type of lignite, [1] the lowest rank of coal, and is a gemstone.Unlike many gemstones, jet is not a mineral, but is rather a mineraloid. [2] It is derived from wood that has changed under extreme pressure.

  6. Diamond (gemstone) - Wikipedia

    en.wikipedia.org/wiki/Diamond_(gemstone)

    Currently, gem production totals nearly 30 million carats (6.0 tonnes; 6.6 short tons) of cut and polished stones annually, and over 100 million carats (20 tonnes; 22 short tons) of mined diamonds are sold for industrial use each year, as are about 100 tonnes (110 short tons) of synthesized diamond. [67]

  7. Stonesetting - Wikipedia

    en.wikipedia.org/wiki/Stonesetting

    The earliest known technique of attaching stones to jewelry was bezel setting. A bezel is a strip of metal bent into the shape and size of the stone and then soldered to the piece of jewelry. The stone is then inserted into the bezel, and the metal edge of the bezel pressed over the edge of the stone, holding it in place.