A diamond engagement ring Donald Trump presented to his second wife, the TV star and actor Mara Maples, in 1993 auctioned in New York on June 29.
 Mara Maples sold the ring privately in 1999 |
The Harry Winston-designed 7.4 carat ring realised $300,000 at Joseph Dumouchelle in Birmingham, Michigan.
Maples later sold it for $110,000 in 1999 following the couple's divorce - that's growth of 6% per annum.
If the controversial Republican nominee becomes president, it could be worth substantially more.
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