Are lab diamonds as good as real diamonds?
Quick answer
Lab diamonds are real diamonds. They have the same carbon crystal structure, the same 10 on the Mohs scale, the same refractive index and the same brilliance as mined diamonds. Even a gemologist needs lab equipment to tell them apart. The only difference is whether the stone grew underground over millions of years or in a lab over weeks.
What identical actually means
Lab and mined diamonds are the same material: pure carbon in a cubic crystal lattice. They share the same hardness (10 on Mohs), the same refractive index (2.42), the same dispersion (0.044) that produces fire, and the same specific gravity. IGI, GIA, HRD Antwerp and GCAL all confirm the properties are identical. That is why they are graded against the same 4Cs scale (cut, colour, clarity, carat) rather than a separate one.
Where any difference shows up
The only differences are microscopic and only visible under specialist equipment. Lab diamonds carry growth patterns specific to how they were made: CVD stones show fine striations from layer-by-layer growth, HPHT stones show blocky growth sectors. Trace element profiles are also slightly different. None of this is detectable by eye, with a loupe, or even with a standard diamond tester. It needs a lab instrument like DiamondView or photoluminescence spectroscopy.
Next step
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