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Brazillianite
it detects double refraction
but it's useful guide
brilliant cut (round) only
Digital refractometer by Presidium (model Prim II) Digital scales - regular lines - resolution 0.001g BrazillianiteSummary Made by Presidium, the leading manufacturers of gem testing equipment. There is downloadable software to connect it to your computer. The reading is then displayed along with a list of stones that match the reading, and you can click on each stone to see more information (constants). This saves time looking up charts. Comes with a USB cable (connects to any computer mobile device USB mains adaptor). Works with loose stones and also stones
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