In the Ray of Light necklace from the Tiffany & Co. Blue Book 2024 Celeste high jewelry collection. The necklace features a ...

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 ...