INFOGRAPHIC: The allure of green gemstones

ChristiesInc argues that the most coveted coloured gemstones are green. Emeralds also helped launch the career of the world's most famous jeweller.

"At age 12, Harry Winston turned on of his first profits when he spotted a glimmering emerald being sold as a piece of glass at a pawnshop. He purchased the two-carat gem for 25 cents and sold it two days later for $800."