For over a century, Kashmir sapphires have been the scarcest and most coveted type of sapphire in the world. The first Kashmir sapphire mine was uncovered after a landslide in the Himalayas in ...

It is a type of mineral beryl. Some grid of these gemstones says the ones coming from the Columbian mines are generally more expensive than diamonds due to their comparative rarity. However ...

"These occurrences are the first reported sapphires hosted in this type of marble-related deposit," says Philippe Belley, a graduate student at the University of British Columbia. "We've ...