Fine 1.35ct Round Cut Canadian Jace Necklace in 18K Gold Plated Four Leaf Clover Mount. Jade, the stone of heaven has been prized throughout history. A stone of mystical power, ancient civilizations valued jade as the most precious of all gemstones. The world's finest nephrite jade can be found in the Cassir Mountain Range in British Columbia, the Yukon and Alaska. This tough translucent Stone is challenging to carve, however will stand the test of time and its harsh elements.