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”.

Leave a reply