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jewelry glossary

Antique jewelry glossary

Welcome to our extensive antique jewelry glossary with around 1,500 jewelry related entries.If you feel you are missing an explanation, feel free to let us know and we will add it.

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Inclusion

A foreign material (solid, gaseous or liquid) usually minute in size, that is enclosed within a natural mineral, but not a synthetic gemstone. An inclusion may result from: a pre-existing material that was enveloped by a growing crystal, e.g. specks of iron; a substance formed when the crystal was being formed, e.g. a gas bubble or a change after the crystal was formed, e.g. by heating which causes chamical alteration and recrystallization.

Examples of solid inclusions may be:

  • a needle of ruttle in asteria
  • specks (piqués) of carbon in some diamonds
  • specks of mica in aventurine quartz
  • insects etc., embedded in amber

Examples of liquid or gaseous inclusions may be water or carbonic gas, with sometimes a bubble of gas in the liquid (a 'two-phase inclusion'), and sometimes also an included crystal (a 'three-phase inclusion').

From: An Illustrated Dictionary of Jewelry, autor: Harold Newman, publishers: Thames and Hudson

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