Family-owned jeweller Dehres has an exceptional collection of coloured gemstones, including an ultra-rare blue Paraíba tourmaline that weighs over 60 carats. The brand also has a wealth of large coloured diamonds in all shades of the rainbow—a personal favourite is the Lotus Bloom ring, which has a radiant-cut diamond in a rare fancy vivid pinkish-orange hue. Click through the gallery for a closer look at the tempting rainbow of gems.

(Related: The Secret To Sourcing The Best Diamonds In The World)