Mr. Cuadros is the author of “When We Sold God’s Eye: Diamonds, Murder, and a Clash of Worlds in the Amazon.” In the lead-up to Valentine’s Day, people across the world rush to buy diamond ...

Whether it’s Tiffany or Costco, here’s what you need to know Carol M. Kopp edits features on a wide range of subjects for Investopedia, including investing, personal finance, retirement ...

T HE DIAMOND MARKET has seen some turbulence lately, but there’s no need for despair. Give your customers a reason to fall in ...

After hours: February 14 at 6:23:42 PM EST Loading Chart for OPAL ...

A public benefit, nonprofit institute, GIA is the leading source of knowledge, standards, and education in gems and jewelry. Welcome to GIA. Students around the globe turn to GIA for the knowledge, ...