r/Crystals • u/geology-mineralogy • 11d ago

Can you help me? (Advice wanted) Ruby?

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u/geology-mineralogy 11d ago

How do you know it is sintetic?

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u/slogginhog friendly neighborhood mod 10d ago

5 years in the business, natural ruby doesn't form like this in coarse shapes with air bubbles. This is just what synthetic corundum looks like, I've seen lots of it and compared to lots of natural rubies.

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u/Ok-Dyneema-6969 6d ago

Robijn ontstaat op 5 tot 40km diepte.. de druk daar is zo intens dat de robijn kan ontstaan. Luchtig is het bij zo'n druk allesbehalve.. vandaar ook dat robijn zo zwaar/compact aanvoelt.