Nicole Wegman started Ring Concierge, a fine jewelry business specializing in bespoke engagement rings, in 2013 by posting and selling diamonds on Instagram. The biggest misconception Wegman sees when ...

Experts explain how this element plays a key role in the price and appearance of your sparkler.

Whether you own a diamond that’s sitting pretty on your left ring finger, nestled in a tennis bracelet or pronged on a pair of earrings, you want to know it’s good quality. But it’s hard to be sure.

In a sunlit office on the 23rd floor of the World Diamond Tower, overlooking the corner where 47th Street runs into Fifth Avenue in New York City, men, occasionally couples and sometimes entire ...