I suppose that would depend on who was doing the testing.
A trained gemologist should be able to seperate a diamond and a CZ regardless of what has been done to the diamond especially under magnification. The diamond tester measures the thermal inertia of diamond (the speed which it will conduct electricity) and will not be fooled by enhancement. The diamond tester would be fooled by a moissanite however, so the best test of a diamond is by magnification.
That's an excellent question. I did not purchase this from a local Jeweler. Information about anything has been a slow go betweem mailing and emailing. They do have appraisal, and the ring, they just said their appraiser found it to be a clarity enhanced diamond. I have demanded refund but,hesitation seems to be there company policy. Thank you for your advice.
Wow! It really is unfortunate that this has happened to you. I do really hope that everything works out for you and your refund is given. I'm no lawyer, however it sounds from what you have told me that you have a pretty strong case.
Good luck and keep us posted as to what happens with your situation.