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Jewelry Glossary with Photos: O

Posted by Laurie Zeiden on



OBSIDIAN:  Naturally formed glass-like material found in igneous rock and lava

Oval stones are obsidian; square stones are onyx

OBVERSEThe side of the object bearing the principle design; the front

Obverse and Reverse

ONYX:  Variety of chalcedony; usually black

Oval stones are obsidian; square stones are onyx

OPAL:  Semi-transparent gemstone showing a variety of colors


OPAQUE:  Opposite of transparent; hazy, blurred

OPERCULUM:  Secreted material forming over the gills of some mollusks; often mistaken for seashell


ORGANIC GEMSTONE:  Produced by living organisms; examples include pearl, amber, coral, and ivory


The Jewelry Glossary is a work in progress: As I add more posts, you can access them here:

I hope you enjoyed the photos. To see what's available for sale at my site, visit World of Eccentricity & Charm or click here.

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