Cavity

Cavity: lack of material which, if inside the gem, consists of structural voids often filled with liquids and/or gases with the possible presence of solid phases, all to form the so-called single-phase, two-phase, three-phase and multi-phase inclusions. Cavities are often also referred to as Negative Inclusions.

Biphasic inclusions in Natural Topaz. (Photo: IGI International Gemological Institute Italy)

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