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OPAL TRIPLET [1 record]

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Record 1 1988-05-11

English

Subject field(s)
  • Gemmology
DEF

[Opal] triplets are similar to doublets, except that the layer of precious opal is usually thinner and is topped off with a transparent cap of quartz or synthetic corundum which provides improved wearability.

French

Domaine(s)
  • Gemmologie
CONT

Les opales nobles très minces sont parfois doublées d'un morceau d'opale commune ou onyx : ce sont les doublets d'opale. Les triplets d'opales comportent en plus une couche protectrice en cristal de roche, placée sur le dessus.

Spanish

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