A variation of the word "carat", (used to describe the
weight of a gemstone), "karat", with a "k" is
used to describe the purity of gold. Gold is often alloyed with
silver, copper, and/or other metals to improve its strength and
durability. Products made from gold are marked to show how much
actual gold is contained in the product. Items marked 24K are 100%
pure gold. Items marked 18K or 750 have 750 parts gold out of 1000,
or 75% pure gold. Items marked 14K or 585 have 585 parts out of
1000, or 58.5% pure gold. Much of the jewelry manufactured before
the 20th century do not have these marks and must be tested to determine
Karatclad is a trademark for a very thick gold electroplating process;
this type of plating is about 14 times thicker than standard electroplating.
A costume jewelry company formed in 1940, Kaufman (the comedian
Andy Kaufman's parents) and Ruderman, Inc, New York, NY. The Karu
pin above is paste (glass stones) and enamel on gold-plated metal.
A keeper ring is a ring which is used alongside another, more valuable
ring to keep it securely on the finger.
See Bow Guard.
A jewelry-making technique from Korea where 24k gold foil is fused
to sterling silver.
A keystone is a stone cut the shape of a keystone in an arch. Keystones
are usually step cut. The costume jewelry manufacturer Schreiner
uses keystones in many of its pieces.
The king cut is a modification of the brilliant cut which is used
for large diamonds. This cut has 86 facets.
Anne Klein (1923-1974) was an influential and popular American fashion
designer. Anne Klein jewelry and buttons have been manufactured
by the Swank Inc. since 1981. Anne Klein's logo is a lion's head
on a square tag.
An extremely thin wire holding a gemstone making it appear to float.
A knot is a flaw (a mineral inclusion) in a gemstone (usually a
diamond) that is ar the surface of a gem after polishing. The know
is a small raised bump on the finished gemstone.
The Koh-i-Nur (meaning "Mountain of Light") is one of
the largest-known diamonds. It was found in India and belonged to
the first Indian Rajahs of Malwa (in the 1300s). The gem made its
way to Persia in the 1500s (taken as a spoil of war by the Mogul
Sultan Babur). At some point it was returned to Indiabut was taken
by the East India Company and presented to Queen Victoria of England
in 1850. Tge gem was later cut and set into a brooch and later into
the State Crown of the United Kingdom. The Koh-i-Nur is part of
the crown jewels of England and is kept in the Tower of London,
Opals from the Koroit mines in Australia. These are the hardest
of the boulder opal types and often referred to as "Koroit
picture opals" because of the patterns.
Kramer was a high-quality costume jewelry company founded by Louis
Kramer in 1943. He was then joined by his brothers Harry and Morris.
Some of their pieces are marked 'Kramer,' others are marked, 'Kramer
of New York.' Kramer made jewelry for the Dior company during the
1950's. Kramer went out of business in the 1970's. The fish pin
above is by Kramer.
Kunzite is a transparent pink, light pink, or light purple gemstone
that resembles roze quartz. It is a variety of the mineral spodumene.
Kunzite can fade after prolonged exposure to light. Kunzite is also
called "evening stone," because of its propensity to fade
in bright light. The original color of some kunzite stones can be
restored or even intensified by irradiation. It is usually used
as a large stone and is easily chipped; small stones of kunzite
are difficult to cut. Kunzite is often used in pendants. Kunzite
has a hardness of 6-7 and a specific gravity of 3.1 - 3.2. Kunzite
was first found in 1902 in Pala, California, USA, and is named for
the gemologist George F. Kunz. Kunzite's chemical composition is
Kyanite is a deep sapphire blue, green, gray, or white gemstone.
The color is not always uniform; it can be blotchy or in streaks.
The cystals are crystals are transparent to translucent. Kyanite
has a hardness of 4.5 to 6.5; the hardness varies depending on which
way it is scratched (this happens because kyanite consists of long,
thin crystals). It has a specific gravity of 3.58. Kyanite is found
in Brazil, Burma, Kenya, Europe, India, Australia, Kenya, and the
USA. Kyanite's chemical composition is Al2SiO5; it is composed of
andalusite and sillimanite.