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The dark spots in this spinel are really several reflections of a single inclusion . The inclusion’s position and the spinel’s cut caused the reflections. - Photo by John I. Koivula/GIA
These are rows of negative crystals, which are hollow spaces that took on the octahedral crystal shape of the spinel that contains them. - Photo by John I. Koivula/GIA
This spinel’s inclusion consists of a group of fractures, or cracks, that form a star. - Photo by John I. Koivula/GIA

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