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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]
Just as the angle of the sides of a cabochon creates the pressure to hold the stone in place, so there is an overlying principle in setting faceted stones. If one looks at a side view of a round diamond, for example, one will see that there is an outer edge, called the girdle, and the top angles up from there, and the bottom angles down from ...
A gemstone (also called a fine gem, jewel, precious stone, semiprecious stone, or simply gem) is a piece of mineral crystal which, when cut or polished, is used to make jewelry or other adornments.
Carbuncle (/ ˈ k ɑːr b ʌ ŋ k əl /) is another name for a deep red almandine gemstone that has been cut with a smooth, convex face in a method called cabochon. [1] Traditionally, the term referred to any red gemstone, most often a red garnet. [2] Carbuncles and their chimeras have spanned three millennia.
Green diopside crystals included within a white feldspar matrix are also sold as gemstones, usually as beads or cabochons. This stone is often marketed as 'green spot jasper' or green spot stone'. Violane is a manganese -rich variety of diopside, violet to light blue in color.
Lapidary (from the Latin lapidarius) is the practice of shaping stone, minerals, or gemstones into decorative items such as cabochons, engraved gems (including cameos), and faceted designs. A person who practices lapidary techniques of cutting, grinding, and polishing is known as a lapidary or lapidarist .
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