Group of faceted blue topaz gemstones,variopus shapes weighing about 5 to 15 carats. Although natural blue topaz of this color does exist,the vast majority of such stones are colored artificially by subjecting white (colorless) topaz to irradiation and heat | |
Licence : | Droits gérés |
Crédit: | Science Photo Library / Arem, Joel |
Taille de l’image : | 3851 px × 2550 px |
Model Release : | Non requis |
Property Release : | Non requis |
Restrictions : |
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