My name is Luca. I am new in gemology. I started studying the elearning course offered by IGS.
I would like to know your opinions about some steely blue sapphires from Tanzania. I bought them online and the seller declared these gems are completely natural, without any heat enhancement. The smaller stones were mounted on a bar-shaped earrings. I examined one of these stones under microscope (x100, but it was a biological microscope - I am a doctor- and I have still to buy a stereomicroscope for gemology).
Anyhow, here the images (the first one is the gem mounted on the earring, the second one is the gem under microscope:
The image under magnification seems to my inexperienced eye a rutil silk spider web! This should mean that no heat treatment has been used.
What do you think about this?Thank you for your replies!!!