A jade bracelet contains unusual fillers, used to create a smooth surface.
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A pearl, thought to be natural, is revealed to be a bead-cultured specimen with a pre-drilled nucleus.
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A bangle, thought to be jadeite jade, is revealed by laboratory testing to be polymer-impregnated aventurine quartz.
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The effect of irradiation on scapolite with tenebrescence, a colour-change phenomenon that occurs after exposure to UV light.
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Lead-glass-filled orangey yellow sapphire undergoes laboratory observation.
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