Explore the British Royal Family's Dazzling Collection

5. Engagement Ring with a Single Diamond Solitaire

Outfitted by: Zara Tindall As of 2010: Value Estimate: $170,280* Mark Phillips and Princess Ann are the parents of Zara Tindall. She is twenty-first in line to inherit the British monarchy because she is the eldest grandchild of Queen Elizabeth and Prince Philip. 2011 saw Zara and Mark tie the knot in an opulent wedding.

Engagement ring with a single diamond ©Max Mumby/Indigo/Getty Images Her engagement ring was a solitaire diamond ring worth well over $150,000 when her spouse proposed to her in 2010. That year, the 1.5-carat diamond that stole the show was the talk of the town, as everyone was in awe of Zara's magnificent ring. Beaverbrooks, the ring's creator, called the significance of the design "incredibly romantic."