A 6.24-carat fancy deep blue diamond, was purchased by Moussaieff Jewellers for $12.7 million. 21 jewels by JAR Fetched $7.1 Million at Christie’s Geneva Jewelry Auction ...

Diamonds are forever, and gold is precious, but which is rarer ... (The mantle is the layer of Earth beneath the crust.)"Diamonds formed deep in the Earth's mantle can be brought up by deep ...

“We have been seeing thicker gold bands and diamond cuts like marquise and pear shapes become increasingly ... because they are deep [stones], they always look visually smaller than any of ...

A new international study led by researchers at the Guangzhou Institute of Geochemistry in China has uncovered how carbon ...