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If you own a DuoTester without the set of 7 Diamond Simulants, you can purchase that Simulant set separately here, consisting of seven different species of faceted gemstones, namely:
These gems are nicely faceted, and approximate 5mm in diameter. Notice in the photo how the gems fit nicely, organized, and labeled in the "hidden" drawer on the side of the DuoTester enclosure.
You can use them as reference stones to check the calibration of your DuoTester. Or, if you are a gem collector, there are some rare species in this group (although most synthetic), and would be considered very good value for the money.
This item typically ships within 1 business day.