They are irradiated. But I don't think that has any bearing on their durability. And they have a hardness of 8, but have perfect cleavage, so if you knock it on the right spot, you could have a shattered stone. BUT, the same cleavage is also in diamonds, so take that for what it's worth.
Disadvantage: None if you don''t have a problem with the treatment, which is safe and permanent. It''s hard to find stones that aren''t treated one way or another these days. I searched and have yet to find any real evidence of treated spinels or garnets (except demantoids, which sometimes are heated to improve their color permanently).
I had a loose blue topaz princess cut stone that was incredibly beautiful - I had it set into a soliataire ring setting and the jeweler chipped it during the setting process - it was chipped on the underside of the stone, so I still wear it occassionally, but I know the chip is there and it bothers me so much
- But I have scratched it and have a very tiny chip in it that I caused - If I would do it over, I would have made a pendant with it - I'm just too hard on it as a ring....
I guess it depends upon how hard you are on your rings. I have a lovely emerald cut blue topaz ring that I''ve had for several years. It''s worn quite often but I have yet to scratch or chip it.
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