Good said lab-grown diamonds tend to cost about 30 to 40 percent less than mined diamonds of the same carat, colour, cut and clarity. Near New York City's Diamond District, gemologist David ...

In honor of Valentine's Day, here's a look back at 40 other memorably ... with a 15-carat, cushion-cut diamond ring designed by Lorraine Schwartz that was estimated to cost upward of $3 million ...