The gemstone spinel, known for its vibrant colors resembling gems such as rubies and sapphires, has now been shown to be ...

Found mostly in Sri Lanka and Tanzania, taaffeite is one of the rarest gemstones, with only a handful of gem-quality specimens available. It is priced at a remarkable $35,000 per ...

Rare gemstones and crystals are highly prized not ... Initially, taaffeite was confused with spinel, a common mineral that ...

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 ...

Gemstones have been a topic of fascination ... as a polished stone initially mistaken for spinel. It has a double refraction, a property not found in spinel, and a dazzling lavender to pinkish ...