A pink-purple diamond ring weighing 7 carats is expected to fetch between $3.25 and $4.25 million at a Sotheby's auction on ...

How do you know your diamond isn't fake? How to make a diamond in a day Purple-pink diamond sells for $26.6m (£20.1m) In 2020, worldwide lab-grown diamond production grew to between 6 and 7 ...