Custom Watermelon Tourmaline Pendant in 18k Yellow Gold This pendant is crafted in 18k yellow gold and features a bezel-set watermelon tourmaline in a custom design. The tourmaline weighs approximately 2.7 carats. The pendant measures approximately 1.75 inches by 0.5 inch and weighs 1.49 grams. Tourmaline, the birthstone for October, is associated with balance, protection, and compassion.