Karat: weight measurement equal to one twenty-fourth part of gold in an alloy.
Karat Clad: registered trade name of heavy gold electroplate of at least 100 microns thick as specified by the Federal Trade Commission.
Karat Gold: Gold which is over 10 karats.
Kashmir Sapphire: the most sought after type of sapphire, from Kashmir.
Kazanjian Red: One of only three red diamonds known to exist in the world.
Keeper Ring: ring worn to stop another, more valuable ring, from slipping off.
Keshi: Secondary pearl created after a pearl has already been produced. Normally very small and non-symmetrical.
Kitemarks: A diamond-shaped (or lozenge-shaped) Design Registration Mark (1842-1883), known as a “kitemark” used on jewelry and other decorative items. Indicate the date a particular design was registered, similar to a patent mark.
KJL: manufacturer of jade Art Deco style costume jewellery.
Koh-i-Noor Diamond: diamond of 106 carats currently part of British Crown Jewels. Reported to be 5000 years old and has passed from hand to hand throughout history.
Kunzite: Type of gem. Rose-violet colour.
Kyanite: Type of gem. Can be light to dark Blue, colorless, gray or brown (banded with blue).
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