Aluminum oxide (known in its naturally occurring, crystalline form as corundum) and a cut ruby. Rubies are an impure form of aluminum oxide, which is used in grinding wheels and sand paper. Rubies are used in jewelry and lasers.
| px | px | dpi | = | cm | x | cm | = | MB |
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Creative#:
TOP22084169
Source:
達志影像
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RM
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須由TPG 完整授權
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