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Terms for subject Jewelry (567 entries)

opal	A mineral, an amorphous form of silica, SiO2 with some water of hydration, found in many varieties and colors, including a form that is milky white.
opalescence	Milky blue form of iridescence.
opaque	Not transparent or translucent; impenetrable to light; not allowing light to pass through.
open back	A style of ring that does not connect in the back. The rings are often used for pinky and toe rings because they are very easy to adjust.
open shank	When the shanks, or sides, of the ring split along the side and are open to the back.
opera length	This term refers to a long necklace that is usually 24 to 36 inches in length. The term was coined as women flocked to the opera in long strands of pearls. Today the term can be used with any type of necklace.
organic	Living matter or that which was once living.
organic gem	Gem made or derived from living organisms, like amber.
orient	The shimmering, iridescent play-of-colour seen on or just below the surface of the pearl.
oriental pearl	A natural pearl.
overlap ring	A ring wherein the gemstones are placed so that they overlap one another.
overlay	A decorative technique which involves two separate pieces of metal. Each piece, which is usually hammered flat, receives different treatments to produce the look. The top piece is sculpted or cut into a specific design and the bottom piece is darkened th
oxidation	A chemical reaction between different types of metals and the air. Tarnish is the result of the oxidation process with sterling silver and pure silver.
P. Fucata	Oyster used to produce Japanese and Chinese cultured pearls.
P. Margaritifera	A pearl-producing oyster with black, white, or golden colored "lips. The black variety of this mollusk is used to create Tahitian black pearls.
P. Martensii	A pearl-producing oyster used in Japan and China, smaller than Maxima and capable of producing pearls up to a maximum of about 10+ mm.
P. maxima	A large oyster used to produce South Sea cultured pearls.
parcel of gemstones	A way to purchase gemstones either mixed or of one type, that are sold according to their carat weight. Buying by the parcel is a popular way for artisans who use multiple gemstones in cluster jewelry.
partial bezel setting	Also called a split bezel or partial bezel, this type of setting is often used with a varied setting. The bezel portion only cradles on side of the gem and the other is held in place by another variety of setting, usually a prong type setting.
paste	Glass made to imitate gems.