Nondestructive Testing for Identifying Natural, Synthetic, Treating, and Imitation Gem Materials
Figure 1-3
Figure 1 - Diamonds always show single refractive appearance of the facets when observed through a fashioned piece with a 10x magnifier or a binocular microscope (photograph taken at 12x).
Figure 2 - Ultraviolet fluorescence images observed in a natural diamond. Blue fluorescence and octahedral growth zonings are seen in the natural diamond (photograph taken at 20x).
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Figure 3 - Ultraviolet fluorescence images observed in a synthetic diamond. Octahedral and cubic growth sectors are observed with different fluorescence colors in the synthetic diamond (photograph taken at 20x).
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