You suggest that it would be fraud to not advise that a treated
Songea sapphire which has become , for all intents, a ruby, was
the result of heating an otherwise "worthless" sapphire.<<
This rasises another question, how do you know that $2000/ct ruby
that came out of the ground isn't a naturally heated 'worthless'
The same can be said for stones whose color has been
changed/enhanced by radiation. How do we know that a 'naturally blue
topaz' wasn't zapped by mother nature before being mined?
Don't get me wrong, I don't endorse pulling the wool over someone's
eyes. If a stone is 'enhanced' in any way the consumer MUST be told
when they purchase the stone. If they aren't, then jewelers will end
up with a reputation worse than used car salesmen & lawyers.