Rare blue diamond ring to be auctioned (1/3)

A model presents a fancy deep blue rectangular-cut diamond weighing 7.03 carats, mounted by jeweller Moussaieff and which is expected to fetch between US$10 to 14 million, during a Christie's auction house preview in Geneva, Switzerland, November 7, 2019. (Photo/Agencies)

A model presents a fancy deep blue rectangular-cut diamond weighing 7.03 carats, mounted by jeweller Moussaieff and which is expected to fetch between US$10 to 14 million, during a Christie's auction house preview in Geneva, Switzerland, November 7, 2019. (Photo/Agencies)

A model presents a fancy deep blue rectangular-cut diamond weighing 7.03 carats, mounted by jeweller Moussaieff and which is expected to fetch between US$10 to 14 million, during a Christie's auction house preview in Geneva, Switzerland, November 7, 2019. (Photo/Agencies)