Gemstones, including rubies, emeralds, and sapphires, can be sold for cash, much the same as diamonds and other jewelry.

A 10.3-carat fancy vivid blue diamond, "The Mediterranean Blue," mined from South Africa's Cullinan mines, sold at auction in Geneva for $21.5 million, slightly above its estimated value.

Since then, the neon blue gem has become ubiquitous and prices have rocketed. Through her gem portfolios, Hangartner works with clients to use gemstones for wealth preservation.