A Rare Untreated Morro Redondo 11.87tcw Watermelon Tourmaline & Diamond 18kt Yellow Gold Ring. This stunning intense pink/blue/green tri-color emerald cut untreated natural Brazilian Watermelon Tourmaline has outstanding clarity with very slight visible inclusions. Pictures are magnified 50x to show detail and are not visible to the naked eye. This mesmerizing, glowing, tri-color is most…