Here’s one sapphire ring that never stopped making waves. The ring is from Garrad Jewellers, and was first given to Princess Diana by Prince Charles in 1981.
A family heirloom, the ring was recently given by Prince Charles to her long time girlfriend Kate MIddleton. Princess Diana died in a car crash in 1997, the ring said Prince William was his was of sharing the day with his mother.
Source
http://www.sapphireengagementring.info/sapphire-engagement-rings/prince-williams-engaged/