Framed with rhodium plated sterling silver this stunning contemporary necklace features three hexagonal prism shaped black onyx gemstonesblack onyx has been used in jewellery for centuries most notably in ancient cameo jewelleryblack onyx informationnumber of stones 3stone shape hexagonstone size 1 x 9mm x 9mm 2 x 7mm x 7mmcarat weight 545ctnaturalcreated natural black onyxcountry of origin brazil