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Machine Stamping
Machine stamping or
die-stamping is a process of making patterns . In this method the
sheet metal is cut and shaped between two dies to form a pattern in relief. Two steel dies are
used, namely the male die and female die. The male die has the design in cameo
and the female die has the design hollowed out. The male
die is put on top of the metal, the female die is put on the
underside of the metal. They are forcefully pressed to force the
metal into the shape of the mold.
Marquise
A stone shape in which the stone has an oval like shape with two pointed ends.
Matinee – Length
It is a type of a necklace which is a single strand
and 22 to 23 inches (56 to 58 cm) long. Matinee-length
generally refers to a string of pearls that hangs to the top of
the cleavage.
Matte finish
A
soft, lustrous finish on the surface of the metal that reduces the metal’s reflectivity.
Melee
A small diamond, under .20 carat.
Memory wire
A tough, stiff wire used for necklaces and
bracelets to
retain their shape.
Microcrystalline
A type of mineral
structure in which the crystals are so small that they can only
be seen with a microscope.
Micron
A unit of length equal to 0.001
mm (millimeter)
Milk and honey effect
It is an effect in which
the apparent coloring of a stone changes from milky to the color
of honey with the change of angle of the light. When a light is
shined on the stone, one side of the stone is the color of milk
and the other is the color of honey. When the light changes
direction, the color effect also shifts. Cat’s-eye exhibits this
milk and honey effect.
Millegrain
A stone
setting in which the stone is secured by tiny beads [grains] of
metal or a band of metal that is decorated with tiny beads of
metal.
Mine cut
Mine cut stones have a cushion – shaped
girdle.
Mixed cut
A style in which the
facets above and below the girdle are different. A standard mixed
cut is brilliant cut above and step cut below.
Mohs scale
It is a scale that measures a
hardness of a substance, how resistant it is to being scratched.
The mohs scale, ranges ranges from 1 to 10, and one
substance is considered harder than another if it can scratch it.
Molded Cameo
Cameos made by the molding process and not by carving the
material. These cameos are usually made from
plastic, glass, or porcelain that is formed in a mold.
Monoclinic
A type of minerals that have a crystalline
structure in which there is one two-fold axis of symmetry. The
examples of monoclinic minerals are Jade, malachite and
moonstone.
Moonstone
Moonstone or the orthoclase, is a semi-translucent
stone that is made of albite and orthoclase feldspar. It is
usually whitish – blue, but can be colorless, yellow, orange,
gray, or even reddish. Moonstone is usually set as a cabochon.
Moss Agate
Also known as Mocha stone (in
Britain and the USA) it is a green variety of agate. It is
chalcedony that has dendritic inclusions of green hornblende. Moss agate has a hardness of 6.5-7 and a specific
gravity of 2.6. green moss agate is fond in India, and some other
locations.
Mother – of – Pearls
It is the iridescent coating on the inside
of oyster shells, which is used for jewelry, buttons, and other
uses.
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