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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 are more durable than ...

  3. Taaffeite - Wikipedia

    en.wikipedia.org/wiki/Taaffeite

    Taaffeite (/ ˈ t ɑː f aɪ t /; BeMgAl 4 O 8) is a mineral, named after its discoverer Richard Taaffe (1898–1967) who found the first sample, a cut and polished gem, in October 1945 in a jeweler's shop in Dublin, Ireland.

  4. Helenite - Wikipedia

    en.wikipedia.org/wiki/Helenite

    It is best used in earrings, pendants, brooches, and other types of jewelry where it will not encounter impact or abrasion. Even in these uses it should be considered to be a very delicate stone. If it is used as a ring stone, the facet edges will be easily abraded, the faces will be easily scratched, and the stone might be chipped with even a ...

  5. Diamond (gemstone) - Wikipedia

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

    Total carat weight (t.c.w.) is a phrase used to describe the total mass of diamonds or other gemstone in a piece of jewelry, when more than one gemstone is used. Diamond solitaire earrings, for example, are usually quoted in t.c.w. when placed for sale, indicating the mass of the diamonds in both earrings and not each individual diamond.

  6. Marcasite jewellery - Wikipedia

    en.wikipedia.org/wiki/Marcasite_jewellery

    Marcasite jewellery is jewellery made using cut and polished pieces of pyrite (fool's gold) as gemstone, and not, as the name suggests, from marcasite. [1] Both pyrite and marcasite are chemically iron sulfide, but differ in their crystal structures, giving them different physical properties. Pyrite is more stable and less brittle than marcasite.

  7. Jet (gemstone) - Wikipedia

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

    Jet has been used in Britain since the Neolithic period [26] It continued in use in Britain through the Bronze Age where it was used for necklace beads. [26] Jet necklaces following the plate and spacer design may have been based on Gold lunula. [27] During the Iron Age jet went out of fashion until the early 3rd century AD in Roman Britain.

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  9. Stonesetting - Wikipedia

    en.wikipedia.org/wiki/Stonesetting

    Then a burr of the proper size is used to cut what is known as a "bearing", which is a notch that corresponds to the angles of the stone. The burr most often used is called a "hart bur", and is angled and sized for the job of setting diamonds. The bearing is cut equally into all of the prongs and at the same height above the base.

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