Uncut gems often look fairly ordinary–like rocks. It's only when they are ... There are a number of semiprecious gems, many quite beautiful, but diamonds, rubies, sapphires, and emeralds ...

A rare diamond exhibit in Abu Dhabi, United Arab Emirates, featured a special blue diamond, with the exhibit's worth totaling ...

Diamonds formed in Earth’s lower mantle contain tiny flecks of minerals that are helping us understand the inner workings of ...

While many of us are familiar with famous gems like diamonds and rubies, certain stones are so rare and valuable that even gem collectors may never see them in up, close and personal. These ...

Despite being one of the most plentiful gemstones on earth, the diamond market has been carefully controlled for decades. Supply is restricted, and prices are kept high thanks to some seriously ...

Here’s a look at some of the most expensive gemstones in the world ... Renowned for its striking color and unmatched rarity, blue diamonds like the "Hope Diamond" and the "Oppenheimer Blue ...

A rare blue diamond was on display Tuesday at an exhibition of $100 million worth of the world’s rarest diamonds in the United Arab Emirates’ capital, Abu Dhabi. The eight diamonds on display ...