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  2. Faceting machine - Wikipedia

    en.wikipedia.org/wiki/Faceting_machine

    Dop: The piece of rough gemstone is glued or attached with hot wax to the end of a brass or steel rod, known as a dop or dop stick. The other end of the dop is placed into the quill of the faceting head. The exposed piece of rough usually becomes the bottom of the stone, known as the pavilion.

  3. Diamond cutting - Wikipedia

    en.wikipedia.org/wiki/Diamond_cutting

    This has two meanings in relation to diamonds. The first is the shape: square, oval, and so on. The second relates to the specific quality of cut within the shape, and the quality and price will vary greatly based on the cut quality. Since diamonds are one of the hardest materials, special diamond-coated surfaces are used to grind the diamond down.

  4. Facet - Wikipedia

    en.wikipedia.org/wiki/Facet

    The art of cutting a gem is an exacting procedure performed on a faceting machine.The ideal product of facet cutting is a gemstone that displays a pleasing balance of internal reflections of light known as brilliance, strong and colorful dispersion which is commonly referred to as "fire", and brightly colored flashes of reflected light known as scintillation.

  5. Grinding (abrasive cutting) - Wikipedia

    en.wikipedia.org/wiki/Grinding_(abrasive_cutting)

    Grinding is a subset of cutting, as grinding is a true metal-cutting process. Each grain of abrasive functions as a microscopic single-point cutting edge (although of high negative rake angle), and shears a tiny chip that is analogous to what would conventionally be called a "cut" chip (turning, milling, drilling, tapping, etc.) [citation needed].

  6. Diamond - Wikipedia

    en.wikipedia.org/wiki/Diamond

    The extreme hardness and high value of diamond means that gems are typically polished slowly, using painstaking traditional techniques and greater attention to detail than is the case with most other gemstones; [30] these tend to result in extremely flat, highly polished facets with exceptionally sharp facet edges. Diamonds also possess an ...

  7. Lapidary - Wikipedia

    en.wikipedia.org/wiki/Lapidary

    A 17th century English lapidary text. The etymological root of the word lapidary is the Latin word lapis, meaning "stone". [5] In the 14th century, the term evolved from lapidarius, meaning 'stonecutter' or 'working with stone', into the Old French word lapidaire, meaning 'one skilled in working with precious stones'.

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  9. Lesedi La Rona - Wikipedia

    en.wikipedia.org/wiki/Lesedi_La_Rona

    Lesedi La Rona, formerly known in media as Karowe AK6 or as Quad 1 [1] by the personnel at the mine, [not verified in body] is the fifth-largest diamond ever found, and the third-largest of gem quality. It was found in the Karowe mine, (formerly called AK6) in Botswana on 16 November 2015.

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