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A cabochon (/ ˈ k æ b u ʃ ɒ n /; from Middle French caboche 'head') is a gemstone that has been shaped and polished, as opposed to faceted. The resulting form is usually a convex (rounded) obverse with a flat reverse. [1] Cabochon was the default method of preparing gemstones before gemstone cutting developed. [2]
Download as PDF; Printable version; In other projects Wikimedia Commons; Wikidata item; ... This is a list of gemstones, organized by species and types. Minerals
In Australia, there are numerous gem shows, including an annual gem show called the GEMBOREE, which is a nationwide lapidary competition. There is a collection of gem and mineral shows held in Tucson, Arizona, at the beginning of February each year. The event began with the Tucson Gem and Mineral Society Show and has now grown to include dozens ...
Sapphire (gem corundum of any color except red, especially blue varieties) Sard (a variety of chalcedony/quartz) Satinspar (a variety of gypsum) Selenite (a variety of gypsum) Simetite (a variety of amber) Smoky quartz (a brown or black variety of quartz) Soda niter (synonym of nitratine) Spectrolite (a variety of labradorite) Spessartite ...
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 ...
Astrology determines the gemstones most closely associated with and beneficial to a particular individual. For example, in Hinduism, there are nine gemstones related to the Navagraha (celestial forces including the planets, the Sun, and the Moon), known in Sanskrit as Navaratna (nine gems). At birth, an astrological chart is calculated.
Biggs jasper is used as a gemstone in bolo tie stones, necklaces, bracelets, brooches and other jewelry. It is also of interest to mineral collectors, who sometimes cut slabs of it to resemble landscapes beneath a realistic-looking sky. [1] (p 61)
The largest recorded Yogo rough, found in 1910, weighed 19 carats (3.8 g) and was cut into an 8-carat (1.6 g) gem. [26] The largest cut Yogo is 10.2-carat (2.04 g). [ 11 ] [ 27 ] [ 28 ] Because of the rarity of large rough Yogo sapphires, Yogo gem prices begin rising sharply when they are over 0.5 carats (0.10 g), and skyrocket when they are ...