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Yellow-to-brown-colored mixture of different iron compounds such as hematite and limonite.
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A facet cut which is the predecessor of today's brilliant cut.
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Sedimentary rock made up of very small spheroidal granules often of calcium carbonate cemented together.
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A phenomenal quality in some gems which milky or pearly.
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Gem material which does not transmit light, such as jasper.
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A direction in a doubly refractive crystal which appears singly refractive.
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An epoxy-like product used as a fracture filler.
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Plastic magnifying lenses attached to a headband.
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Gem materials which are partly or wholly comprised of animal or vegetable matter. Exampes include pearl, amber, and coral.
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Finding the best way of cutting a gemstone to maximize its best optical qualities, such as chatoyancy, luster, or inclusions.
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Decorative materials which are usually softer, more opaque, more massive, more common, or less durable than hard translucent or transparent gem materials, but are used for vases, bowls, carvings, bookends, clock faces, etc.
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A few crystals can be added to the polish slurry of hard-to-polish gems.
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In jewelry, the chemical union of oxygen and metal which causes darkness or tarnish.
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A torch flame which used too much oxygen and causes oxide films on metal.
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A torch which burns acetylene gas and oxygen.
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Monday, September 2, 2013
Jewelry Glossary - O
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