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ChristiaanK (talk | contribs) (Chemically pure activated alumina, an uncut sapphire and an uncut ruby (natural, not gem quality). Photograph by BJ Kühn) |
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Latest revision as of 10:47, 20 February 2013
Chemically pure activated alumina, an uncut sapphire and an uncut ruby (natural, not gem quality). Photograph by BJ Kühn
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current | 10:47, 20 February 2013 | 2,147 × 1,431 (1.01 MB) | ChristiaanK (talk | contribs) | Chemically pure activated alumina, an uncut sapphire and an uncut ruby (natural, not gem quality). Photograph by BJ Kühn |
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