Soul is introducing transparency in diamond pricing through its Diamond Jewellery Cost Estimator tool, helping customers make ...

Russel Shor, a senior industry analyst for the Gemological Institute of America (GIA), says that the institute’s 4 Cs—color, clarity, cut and carat—should be judged in a lab by experts.

When shopping for a diamond, whether for an engagement ring or a piece of fine jewelry, you’ll quickly encounter the term Four Cs—Cut, Color, Clarity, and Carat Weight.

In the age of private sales and auction-house theatrics, the old metrics of diamond value—cut, clarity, carat and color—are only the opening act. True connoisseurs are chasing rarity, ...