B. Tiff stainless steel is nickel free and scratch resistant. It will not tarnish, deform or oxidize with everyday use. B. Tiff has tested their stainless steel in spa water; the result did not deform or damage the steel or stone in any way.
Signity Star Stones
These stones area a type of man made diamond, which has a lifetime warranty of never getting cloudy, even in shower, pool, or spa water. Signity Star stones have more "Fire" or dispersion than a natural diamond.