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Aside from Thermal Conductivity, the Presidium Duo Tester II can also test Gemstones based on their Refractive Index. RI is one the most important signatures of a gemstone. It's the ratio between the speed of light in vacuum versus the speed of light in a gemstone. As always, the @presidiuminstruments team have made this test super easy. Watch the full video to see how effortless the whole thing is! Get your own Presidium Duo Tester II. Use our code 𝐁𝐉𝐏𝐃𝐓𝟐 to get 5% off. Link in Bio. #blue
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