Black Onyx Necklace. Gemstone Necklace. 21 Gemstone Options $29.00 Dragons Breath Mexican Fire Opal Necklace $29.00 Lily of the Valley Heart Necklace $27.00 Green Onyx Necklace. Gemstone Necklace. Onyx, Green Onyx, or Rose Quartz $28.00 Howlite Necklace. White Howlite. Gemstone Necklace. $28.00