Please note: If you are using ANY prefab cup, bezel , existing setting in a ring, earrings, etc . it is possible the stone will not fit. Prefab cups, bezels , etc are not standardized and will can greatly from manufacturer to manufacturer . We recommend you purchasing stones in person for fitting. Sizes are approx - hand cut gemstones can vary in depth, diameter, etc up to 1mm . All turquoise stones are stabilized & natural color