A pink diamond of “unparalleled color and brightness” sold for $34.8 million in New York on Thursday, just short of its high estimate of $35 million. Weighing 10.57 carats and named The ...

A rare pink diamond known for its oval shape and vividly pink hue became the most expensive gemstone ever sold at an auction on Tuesday, fetching a record sale price of $71.2 million in Hong Kong.