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2. Opal - Wikipedia

   en.wikipedia.org/wiki/Opal

   The black fire opal is the official gemstone of Nevada. Most of the precious opal is partial wood replacement. The precious opal is hosted and found in situ within a subsurface horizon or zone of bentonite, which is considered a "lode" deposit. Opals which have weathered out of the in situ deposits are alluvial and considered placer deposits.

3. Gemstone - Wikipedia

   en.wikipedia.org/wiki/Gemstone

   These have been a popular shape since ancient time and is more durable than faceted gems. [34] Stones which are cut with a faceting machine by polishing small flat windows called facets at regular intervals at exact angles. [34] Stones which are opaque or semi-opaque such as opal, turquoise, variscite, etc. are commonly

4. List of individual gemstones - Wikipedia

   en.wikipedia.org/wiki/List_of_individual_gemstones

   Andamooka Opal, presented to Queen Elizabeth II, also known as the Queen's Opal; Flame Queen Opal; Galaxy Opal; Halley's Comet Opal, the world's largest uncut black opal; Olympic Australis Opal, reported to be the largest and most valuable gem opal ever found

5. Stonesetting - Wikipedia

   en.wikipedia.org/wiki/Stonesetting

   In the case of faceted stones, a shallow groove is cut into the side of the bezel into which the girdle of the stone is placed, with metal prongs then pushed over the face of the stone, holding it in place; cabochons may also be set into prong settings. In both cases, the pressure and the angle of the prongs holds the stone in place.

6. Facet - Wikipedia

   en.wikipedia.org/wiki/Facet

   Cutting and polishing diamonds in the Netherlands 1946. 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 ...

7. Peridot - Wikipedia

   en.wikipedia.org/wiki/Peridot

   Peridot is one of the few gemstones that occur in only one color: an olive-green. The intensity and tint of the green, however, depends on the percentage of iron in the crystal structure, so the color of individual peridot gems can vary from yellow, to olive, to brownish-green. In rare cases, peridot may have a medium-dark toned, pure green ...