GemPen is a portable instrument for jewelers and gemologists providing the ability to screen diamonds, rubies and sapphires for synthetics and treatments. If doubtful, always consult a reputable gem testing laboratory.
GemPen is a portable instrument for jewelers and gemologists providing the ability to screen diamonds, rubies and sapphires for synthetics and treatments. If doubtful, always consult a reputable gem testing laboratory.
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