Burmese Ruby Diamond Necklace and Earring Set. Platinum necklace set with diamonds of 23.88cts and 18.40cts of natural unheated Burmese rubies. Natural and unheated rubies are extremely scarce. The necklace is paired with ruby earrings featuring one 1.7cts and another 1.5cts unheated Burmese ruby. The rubies are Gubelin-certified.