Passing thru the office the other day was a small parcel of cobalt-glass filled sapphire. Technically not really a sapphire, they a manufactured mish-mash composite of dyed-blue-lead-glass and low quality colorless corundum.
We thought we could snap a few photomicrographs under the microscope and provide a few slides with annotation of what is going inside and outside of these “Franken-Sapphires”.
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