The vast gemstone market can be a maze, but some of the best-known rocks also represent the most investment-worthy. Rubies, emeralds and diamonds are all beloved of collectors, based on their solid returns. But newer entrants like tourmaline and tanzanite have been performing even better as investments.
Like all investments, gemstones carry risk, and profits are not assured. But for anybody interested in building a collection, these are the ones most likely to grow in value, according to Singapore-based Italian jeweller Danilo Giannoni, co-founder of Arte Oro.