The only color which sapphire cannot be is ...
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The only color which sapphire cannot be is red – as red colored corundum is called ruby, another corundum variety. Pink colored corundum may be either classified as ruby or sapphire depending on locale.
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Minerals quiz
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answers
Australia
17
Ukraine
19
Greece
14
Switzerland
25
Poland
1899
the United Kingdom
30
Germany
166
India
26
the United States
189
Austria
38