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2. Cabochon - Wikipedia

   en.wikipedia.org/wiki/Cabochon

   Cutting en cabochon (French: "in the manner of a cabochon") is usually applied to opaque gems, while faceting is usually used for transparent stones. Hardness is also taken into account as softer gemstones with a hardness lower than 7 on the Mohs hardness scale are easily scratched, mainly by silicon dioxide in dust and grit.

3. Faceting machine - Wikipedia

   en.wikipedia.org/wiki/Faceting_machine

   Specialized equipment is required for diamond faceting, and faceting as an occupation rarely bridges the gap between diamond and non-diamond workmanship. A second division can be made between industrial faceting and custom/hobby faceting. The vast majority of jewelry-store gemstones are faceted either abroad in factories or entirely by machines ...

4. Proustite - Wikipedia

   en.wikipedia.org/wiki/Proustite

   Proustite is a sulfosalt mineral consisting of silver sulfarsenide, Ag 3 As S 3, known also as ruby blende, light red silver, arsenic-silver blende or ruby silver ore

5. Stonesetting - Wikipedia

   en.wikipedia.org/wiki/Stonesetting

   It has a flat, polished surface, typically with a transparent surface that refracts light inside the gemstone and reflects light on the outside. [5] In the case of a cabochon stone, the side of the stone is usually cut at a shallow angle, so that when the bezel is pushed over the stone, the angle permits it to hold the stone tightly in place.

6. Cut (gems) - Wikipedia

   en.wikipedia.org/wiki/Cut_(gems)

   A gemstone desired to be used in jewelry is cut depending on the size and shape of the rough stone, as well as the desired piece of jewelry to be made. As a general rule, a cut gemstone will reduce the mass (in carats) by about 50%. [1]

7. Gemstone - Wikipedia

   en.wikipedia.org/wiki/Gemstone

   Many gems are crystals which are classified by their crystal system such as cubic or trigonal or monoclinic. Another term used is habit, the form the gem is usually found in. [12] For example, diamonds, which have a cubic crystal system, are often found as octahedrons. [13] Gemstones are classified into different groups, species, and varieties.