Beginning in mid-1989, I heard about deep surface diffusion treated corundums, or D-SDTCs. Yes, that's right – deeeeep surface diffusion-treated blues. In April, 1990, after learning who was involved, I approached the principals (Las Vegas-based Gem Source) for more info. They were generous in offering both samples for study and information about their marketing plans. They planned, and have, sold the material for what it is – surface-diffusion treated corundum.
But all was not well in the Land of Blue. Jeffery Bergman of Gem Source told me in June 1991 that he had received more than ten death threats, presumably coming from paranoid Bangkok dealers who feared that the D-SDTCs would wreak havoc on the natural sapphire market. Bad craziness indeed, but it couldn't help but bring a smile to my face – the very idea that something might destroy the natural blue sapphire market. "What market?" thought I, "there are practically no natural blue sapphires being traded in 1991."
But all was not well in the Land of Blue. Jeffery Bergman of Gem Source told me in June 1991 that he had received more than ten death threats, presumably coming from paranoid Bangkok dealers who feared that the D-SDTCs would wreak havoc on the natural sapphire market. Bad craziness indeed, but it couldn't help but bring a smile to my face – the very idea that something might destroy the natural blue sapphire market. "What market?" thought I, "there are practically no natural blue sapphires being traded in 1991."
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