> 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...
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.