Ruby. The specimen at top has been polished the specimen at bottom is in its natural state. Ruby is a variety of corundum (aluminium oxide) | |
Licence : | Droits gérés |
Crédit: | Science Photo Library / Biddle, Paul |
Taille de l’image : | 4488 px × 4503 px |
Model Release : | Non requis |
Property Release : | Non requis |
Restrictions : | - |