Impregnated Turquoise Classification
Slightly Yellowish Green If Wax Impregnated, Greenish Blue If Impregnated With Plastic
RI, magnification, SG, spectrum and acrid smell and sweating effect if hot point test is used
If stones are heavily treated the RI can be as low as 1.56. If SG is below 2.60 and has fine color it is a fine indication that some impregnation has occurred. Some heavily treated material can have SG's as low as 1.80 to 2.00.