Sarah Ferguson's engagement ring features a huge Burmese ruby, surrounded by 10 glittering diamonds. The stones form a flower pattern, which is also known as a cluster ring. The gems are arranged on a ...

Rubies are an expensive stone, but that hasn’t kept them from becoming increasingly popular, including in engagement rings. Many people feel that these beautiful gems are well worth their cost.

The crown jewel was a 10.33 Burmese ruby and diamond ring from Sotheby's ... due to a high chromium concentration. Making the stone even rarer is the fact that the cushion-cut gem is unheated.