1. difference: origin of laboratory versus mining
The difference between lab-grown and mine diamonds could be compared to the difference between ice that forms outside on a winter day and ice that forms in your refrigerator. Since mine diamonds are ancient, a more apt comparison might be between ice from an ancient glacier and ice from your refrigerator. But either way, both are ice. Both are frozen H 2 O, regardless of origin.
Lab diamonds are chemically, physically and optically identical to mine diamonds!
2nd difference: growth morphology in a rough diamond
However, → is irrelevant for the polished diamond (because the “inner” is identical).
✓ Growth morphology in rough diamonds does NOT play a role for polished diamonds!
Where Lab diamonds differ from mining diamonds is the growth morphology in rough diamond: Mining diamond → Octahedron (like 2 pyramids together), HPHT → Cuboctohedron (sphere like honeycomb shape), CVD → Cube. But both are on the inside, namely in a cut diamond/brilliant, not able to be differentiated from each other! → irrelevant!