
The 10.3-carat ‘Mediterranean Blue’ diamond could fetch US$20 million
Fancy vivid blue diamonds of more than 10 carats are among the rarest gems in the world, and Sotheby’s is set to offer one in its Geneva High Jewellery sale on May 13. “The Mediterranean Blue” is 10.3-carat fancy vivid blue diamond (the highest grade for a blue diamond) with a VS2 clarity grade, according […]