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They do. Actual diamonds have occlusions, slight color shifts, unique sparkle patterns, and other characteristics.

Grown diamonds are too perfect, and it’s trivially easy to tell the difference. You don’t need a loupe at all.

I don’t own any diamonds, but I like rocks and minerals. Hank from breaking bad would be proud.

> Actual diamonds have occlusions, slight color shifts, unique sparkle patterns

All of which can either be recreated in a lab now, or are likely to be possible before long. See for example synthetic star sapphires.

> I like rocks and minerals

Good for you, so does my step-dad (he's a geologist). The man was a nightmare to try and drag around the New York museum of natural history, I thought we'd never get out of the mineral section...

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