A rare pink diamond has sold for HK$453.2 million (US$57.7 million) in Hong Kong, setting a record for price per carat paid at auction for any diamond or gemstone, according to Sotheby’s auction ...

The Pink Star Diamond Ring – $71.2 Million The Pink Star ... places it among the world’s most valuable rings. The Bleu Royal is another most expensive ring in the world. It is a 17.61-carat ...