The necklace features a triangle-cut pink spinel of over 4 carats, a triangle-cut red spinel of over 3 carats, 17 pear-shaped red spinels of over 44 total carats, and 775 round brilliant diamonds ...

Many early specimens of taaffeite were discovered already cut and polished, often misidentified as spinel. Over time, ...

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 ...