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K L M N O P Q R S T
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- Kahurangi Maori name for the pale green and translucent variety of nephrite.
- "Kandy spinel" a MISNOMER ( COMMERCIAL LABEL ) for the reddish-violet garnet found in Ceylon.
- Kaolin a water-containing silicate of alumina, a product of the disintegration of different rocks. The levigated material is used as a polishing agent.
- Karet mesurement of Diamonds; can be found in all shapes and sizes. The size of the diamond is determined by it's weight in carats. A carat is divided into points is a .75 carats or 3/4 of a carat. Larger diamonds are more rare, and command a higher price. While size is an obvious factor in determining the value of a diamond, bigger is not necessarily better, all 4 C's should be considered.
- Kauri gum see Copal resin.
- Kawakawa Maori name for the ordinary green variety of nephrite.
- Keystone the name applied to a trap-cut stone having an outline in the form of the conventional keystone. See Cuts of stones, Chart 182.
- Kidney stone a name variously applied to either nephrite or to haematite.
- "Killiecrankie diamond" a MISNOMER ( COMMERCIAL LABEL ) for colourless topaz from Tasmania.
- Kimberlite a variety of peridotite, a basic igneous rock which fills the diamond pipes of South Africa. Known also as "Blue ground" which weathers by oxidation at the surface to "Yellow ground".
- "King topaz" a MISNOMER ( COMMERCIAL LABEL ) for yellow corundum.
- Kite the name applied to a trap-cut stone having an outline in the shape of a kite. See Cuts of stones, Chart 182.
- Kites name sometimes applied to the eight crown facets known as the bezels and quoins.
- Knot term used for an irregularity of crystal structure in a single diamond crystal. Owing to the difficulty of finding the cleavage planes such rough diamond is not easily fashioned. Also known as Naat.
- "Korea jade" a MISNOMER ( COMMERCIAL LABEL ) for green serpentine.
- Kornerupine near R.I. 1-665 --- 1-678; S.G. 327 to 3-32; H. 6.5; Rhombic; Colours, yellow, brown and green; Localities, Madagascar, Ceylon, Saxony and Greenland.
- Kunzite violet-pink spodumene, which see.
- Kyanite R.I. 1 712-1 728; S.G. 3 55 to 3 67; H. 5 to 7 and varies with direction; Triclinic; Colours, colourless, sky-blue, green and brown; Localities, Switzerland, Kenya, Brazil and U.S.A. Alternative spelling Cyanite.