Presidium Gem Tester II (PGT II) - Testing Ruby, Diamond, Sapphire

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How To Use Your Senses And A Gem Tester To ID Victorian Blacks

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Is it a Diamond? Ruby or Garnet? Sapphire or Tanzanite? Emerald or Jadeite? The PRESIDIUM GEM TESTER PROVIDES THE ANSWERS!!! The Presidium Gem Tester

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Presidium Gem Tester II (PGT II)

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