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Your phone can help you ID gemstones. No, there isn't an app for that, but this technique can be used anywhere with everyday objects and here is how it works.
For a deeper dive into the Polariscope:
• Gemstones go to Disco?...
Bull's Eye Optic figure in Quartz:
• Bull's Eye: One Test t...
Cabochons in the Polariscope
• Easy Gemstone ID