Assortment of blue topaz in its rough state prior to cutting. Although natural blue topaz does exist,the vast majority of such stones are colored artificially by subjecting white (colorless) topaz to irradiation and heat. This treatment is done prior to cutting | |
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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