The Hope Spinel will be among the top lots of Bonhams London Fine Jewellery Sale on September 24. The 50.13-carat octagonal step-cut spinel is expected to fetch $240,000 - $310,000. However ...

The 50.13-carat Hope Spinel fetched $1.47 million at the auction, easily shattering its high estimate of $310,000. The gem set a world record for achieving a price of $30,000 per carat ...

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 ...

In the movie, it’s revealed that Pink Diamond actually learned that she’d be getting a colony of her own (Earth) while on a special world created just for her — and her companion ...