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.

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.

A 20.08-carat D color VS1 clarity diamond on a platinum ring with round diamonds with an estimate of $800,000 - $1.2 million. A platinum ring centered with a 19.14-carat emerald-cut diamond with D ...

The Hope Diamond, which was originally mined in India but is now housed at the National Museum of Natural History, has a lower clarity rating of VS1, but a larger size at 45.5 carats.

Earlier, Lightbox related their prices to the “Color,” “Clarity” and “Cut” of their diamonds. Those are among the “4Cs” of accessing a diamond’s quality, with the last one being ...