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- Mabe - A Japanese term for half-sphere cultured pearls, which are cultured against the shell so that only half a cultured pearl is formed
Malachite - A mineral which characterised by bands of light and dark green
Maltese cross - A cross with four broad arms of equal length, with tops that look like inward-pointing arrowheads
Marcasite - Crystallised iron pyrites ("fool's gold"), cut or uncut. Marcasite is a grey, lustrous mineral
Marquise - An oval shaped gemstone, cut to have pointed ends. It's named after the Marquise de Pompadour, Mistress of King Louis XV
Matte - A non-shiny, frosted surface
Mesh - A chain which is fabric-like and woven of fine wire
Metallic - A shiny, lustrous appearance
Millefiori - Means 'thousand flowers' in Italian. A glass-making technique whereby rods of glass of varying colours and lengths are fused together, then cut into pieces to display ornamental cross sections
Millgrain edge - Beaded or ridged, like the edge of a coin
Mineral crystal - see quartz
Mohs scale - A scale of mineral hardness devised by Frederich Mohs in 1812, ranging from talc (1) to diamonds (10).
Moonstone - A translucent stone which is often bluish in colour; sometimes white
Morganite - A pink variety of beryl. Found in California, Brazil and Madagascar
Mother-of-pearl - Hard, iridescent substance that forms on the inside layer of a pearl-bearing mollusc
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- Nacre - A shiny, iridescent substance made from the lining of mollusc shells or fish scales
Nephrite - A hard type of jade with colours ranging from white to dark green and grey or brown to black
Nugget - A lump or irregularly shaped mass
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- Omega - Chain with a flattened, solid surface formed by the dense links
Onyx - A semi-precious white or grey stone composed of chalcedony (a variety of quartz). The white variety is generally dyed black for onyx
Opal - A non-crystalline, iridescent gemstone
Opaque - Not transparent; does not reflect light
Open work - A pattern of openings in an ornamental piece
Overlay - A decorative layer
Oxidation - Metal blackened by a reaction with oxygen. The appearance is achieved by a chemical process
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Panther link - A flat chain in which solid links are arranged like bricks
Patent leather - Leather with a highly glossy finish
Pave setting - A setting in which small stones are set as close as possible, so that the piece literally looks "paved" with stones
Pearl - A smooth, round growth formed naturally within the shell of a mollusc and used as a gem
Pendant - An ornament suspended from a simple chain
Peridot - A transparent, olive green gem
Point - Unit of weight for gemstones equal to one-hundredth of a carat
Precious stones - Rare and costly gems such as diamonds, emeralds, rubies, and sapphires
Princess cut - Similar to a brilliant square-cut gemstone
Pyrope garnet - A deep red mineral, similar in appearance to ruby |
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