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 | |
Lizenzart: | Lizenzpflichtig |
Credit: | Science Photo Library / Arem, Joel |
Bildgröße: | 3851 px × 2550 px |
Modell-Rechte: | nicht erforderlich |
Eigentums-Rechte: | nicht erforderlich |
Restrictions: |
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