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Lab Ruby
(sapphire)
It is a synthetic laboratory – made stone. It is same in
composition, hardness, and specific gravity as natural rubies but
is much less expensive than a natural stone. These lab-produced
stones can be legally referred to as “real” stones as opposed to
“natural” (mined) stones.
Lapidary
An artisan or a person who cuts and polishes gemstones.
Lapis lazuli
A rich blue opaque, a semi-precious stone that has been used in
jewelry since olden times. It is often dyed to deepen and
improve its color, has a hardness of 5.5 and chips and scratches
easily. It has a specific gravity of 2.4 to 2.9.
Lavalier
A pendant with a dangling stone that hangs from a necklace.
Leaf
It is a metallic leaf, a paper – thin sheets of metal that is
applied to the surfaces.
Lentil cut
It is a cabochon cut in which the upper and lower portions of the
stone are similar or identical.
Lobster claw
clasp
A jewelry fastener that resembles the claw of a lobster, hence
the name. There is a small spring that keeps the arm of this
clasp closed. It is used to attach two other tings or links of a
necklace or bracelet.
Locket
A pendant that can open up. Such lockets can hold photos, hair, a
charm, or other small, precious object.
Lost wax casting
A very old method of metal casting in which the original model is
sculpted in wax. The wax is then enclosed in clay and the wax is
melted out, making a hollow mold. The mold is then filled with
molten metal. The clay is broken off and the cast metal remains.
Lozenge
A lozenge cut stone is a step – cut gem with a diamond shape.
Luster
Luster literally means spark or shine. A stone’s luster is its
sparkle or sheen – the way it reflects light. This luster
depends on the nature of the stone’s surface reflectivity. Some
types of luster include: adamantine, earthy, greasy, metallic,
resinous, pearly, pitchy, silky, vitreous, and waxy.
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