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Use this set of 6 stones to practice getting Refractive Index readings on your refractometer. Set includes Citrine (1.53-1.54), Aquamarine ( 1.56-1.60), Yellow Labradorite (1.56-1.57), Swiss Blue Topaz (1.61-1.64) , Peridot (1.67-1.70), and Rhodolite Garnet (Pyrope) (1.72-1.76).