That rainbow flash you see is likely from internal fractures, not the gem's structure. Real rubies rarely have bubbles—that's more common in glass imitations. I say this with some regret, because I once bought a similar "ruby" ring in Panjim's Friday market, dazzled by those rainbows. My now-ex fiancée loved it until her jeweller uncle held it to the light and sighed, "Bhava, even your chemist eye should see these are bubbles.
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