Liquid inclusions in a heated ruby

I am looking at a parcel of rubies. As a gemologist I note obvious discoid fractures, dissolved rutile needles, and melt relics. In some of the fractures and fingerprints I have made not of a liquid. I am slightly confused because I don’t understand how a heated ruby can appear to have liquid inclusions. When using oblique lighting I am able to get a violet to orange flash. ( have to try hard to get the flash ). I’m wondering if this is some type of filling used after heat treatment or if liquid inclusions can withstand heat treatment.

Any photos of similar inclusions would be greatly appreciated!

Thanks in advance for the advice.


Curious Gemologist

Hi, I’m only a Gemology student but I know that colour flash like that could indicate fracture filling. So not only do you have treatments such as heating, you also have fracture filling and Beryllium treatment. The BE treatment I believe is pretty hard to detect without specialised equipment and also that even buying “direct from a miner” isn’t a guarantee it hasn’t been through some or many “enhancement processes”.

@Sef20 It sounds like it could be a glass filling? I don’t believe liquid inclusions would handle the heating process. The refractive index of the glass will be different than the ruby, so that is one way to test if it is glass filling. Hope this helps! :grinning: -Eric

Hi, yes I would think that it sounds like glass filled ruby, with the different flash coming off the glass fill, you should normally be able to pick up some small bubbles as well in the glass fill.
you should also be aware that treaters in Thailand are also heat treating and glass filling blue, green and yellow sapphire.

You got the horizontal flash or vertical flashes of colors?