While the classic Round Brilliant continues to reign supreme as the most sought-after diamond shape for ... The Long Hexagon cut is sleek and edgy, ideal for east-west settings or art deco ...

Among them are a 8.2-carat blue sapphire ring, set to go for anywhere from $300,000-$500,000, and a 10.95-carat round brilliant-cut diamond set in gold, which will go for somewhere between $40,000 ...