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  2. Tumble finishing - Wikipedia

    en.wikipedia.org/wiki/Tumble_finishing

    A collection of gemstone pebbles. Most of these stones, except four rough ones, were tumbled and polished. Tumbling of rocks as a lapidary technique for rock polishing usually requires a plastic or rubber-lined barrel loaded with a consignment of rocks, all of similar or the same hardness, some abrasive grit, and a liquid lubricant.

  3. Lapidary - Wikipedia

    en.wikipedia.org/wiki/Lapidary

    While the gemstone in the rough state may be trimmed to remove undesirable material or to separate it on a cleavage line with a diamond bladed saw, accurately described as cutting and once done by the use of a chisel or similar tool to simply break off pieces that were usable as single gemstones, the actual shaping and polishing of a gemstone ...

  4. List of U.S. state minerals, rocks, stones and gemstones

    en.wikipedia.org/wiki/List_of_U.S._state...

    In 1986, California named benitoite as its state gemstone, a form of the mineral barium titanium silicate that is unique to the Golden State and only found in gem quality in San Benito County. [ 80 ] ^ Colorado is the only state whose geological symbols reflect the national flag's colors: red (rhodochrosite), white (yule marble), and blue ...

  5. Beryl - Wikipedia

    en.wikipedia.org/wiki/Beryl

    Red beryl has been known to be confused with pezzottaite, a caesium analog of beryl, found in Madagascar and, more recently, Afghanistan; cut gems of the two varieties can be distinguished by their difference in refractive index, and the rough crystals easily by their differing crystal systems (pezzottaite trigonal, red beryl hexagonal).

  6. Heliotrope (mineral) - Wikipedia

    en.wikipedia.org/wiki/Heliotrope_(mineral)

    A rough specimen of bloodstone Heliotropes (from Ancient Greek ἥλιος ( hḗlios ) 'sun' and τρέπειν ( trépein ) 'to turn') (also called ematille , Indian bloodstones , or simply bloodstones ) are aggregate minerals, and cryptocrystalline mixture of quartz that occurs mostly as jasper ( opaque ) or sometimes as chalcedony ...

  7. 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.

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