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Geometric fingerprint in a heated sapphire

Geometric fingerprint in a heated sapphire

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Geometric fingerprint in a heated sapphire

Sometimes, in gemstones, when you get the right angle of illumination, you can see rainbows in cracks and healed ones (fingerprints). It's easier to see it with an analyser filter.

Most beautiful ones are when liquids and/or gases are in the game, the rainbow can even sometimes move when heated by the lightbulb.

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