Nondestructive Testing for Identifying Natural, Synthetic, Treating, and Imitation Gem Materials
Figure 4-6
Figure 4 - Two-phase (liquid and gas) inclusions are observed in a synthetic ruby grown by a hydrothermal method (photograph taken at 20x).
Figure 5 - Brazil twinning is observed in most natural amethyst (photograph taken at 20x).
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Figure 6 - A stream-like growth structure is observed in a synthetic amethyst grown from fluoride solution (photograph taken at 20x).
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