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A spinel, emerald and diamond ring set with an oval-cut pink spinel, a marquise-cut emerald and two brilliant-cut diamonds
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Princeton University10y
Spinel, part 1
Spinel, MgAl 2 O 4 (download cif), is a rare gemstone that was used to imitate rubies. The structure has face-centered cubic symmetry, and is a little heavy to understand. The general formula is AB 2 ...