Four Treasures Reference Database
Record No. 6204
Gem News International: Black star sapphire with dual treatments
Journal Article
Hughes, R.W., Hughes, E.B. and Manorotkul, W. (2020) Gem News International: Black star sapphire with dual treatments. Gems & Gemology, Vol. 56, No. 3, Fall, pp. 442–443.
ISBN/ISSN: 0016626X | RWHL
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gems, corundum, Thailand.12, treatments.6
A large black star sapphire was brought in for testing. Two large pits on the base were carefully filled with brown dopping varnish. After removal of the varnish with alcohol, it was found that a large portion of the base had been filled with a lead glass.