Cosmetics And Gem Materials

(via The Journal of Gemmology, Vol. IX, No.8, October 1964) R Webster writes:

Turquoise and jade
Most turquoise has been treated in some way to improve the color and substances used for this treatment may be affected when cosmetic preparations get on to the surface of the stone. Even good colored non-treated turquoise may be affected by certain cosmetics. Robert Crowningshield refers to a case in which turquoise had discolored, apparently from the effects of cosmetics. There has been no report that jades have been affected by beauty preparations, but as jadeite can be dyed, deleterious effects could conceivably occur with this material.

Cosmetics And Gem Materials (continued)