Gemporia gives codes for treatments in their on-screen graphics. But they don't explain what they mean on air. Or even draw any attention to them.
If you have enough wherewithal to check Gemporia's website, you'll find that there is a section on gem treatments. But it doesn't explain all the treatment codes that Gemporia uses.
Even less helpfully, Gemporia has in the past been caught out on stating the wrong codes in their graphics. Or on a couple of occasions, not mentioned any gem treatments at all when they should have.
Utilising treatment codes is only helpful if a) they're correct, and b) potential customers know how to get proper explanations for them.
Not to mention the fact that Gemporia presenters often screech excitedly about their gems' colours and clarity and compare them to rare and valuable examples sold for millions in the past; they never verbally state that their stones are treated/filled/dyed/heated/reconstructed or whatever. They want the viewers buying emotionally, not paying attention to anything in the on-screen graphics beyond the often ludicrous start price, and the final one.
Gemporia gives as much information on their gems as TJC. But they deflect criticism by stating that treatment codes are shown on screen. This happened to me when I raised this with the company on Facebook a while ago. But they went very quiet when I asked why presenters never mention them, why they very rarely tell viewers to check the website for more information on treatments, and why only a few select codes are elaborated on.