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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.