You really cannot tell by looking if a stone is natural or dyed. Crystal quartz or precious amethyst. Have you considered finding out how to test or getting them tested? MOHS hardness scale will narrow it down. Do some research before listing, please. To avoid regrets and maybe underselling yourself.
Thank you Alice for the question and information. I gave all of the information I had, which is none really. If I felt these had much value I would NOT have put them on LISTIA, I would have had them checked out, and either kept them, or sold them. Their cost to me was minimal, so I don't feel that my time researching, cost of appraisal would make them any more valuable. I could put CZ's on here and list them as DIAMOND, but my reputation would be ruined, so I'm always honest and have provided all the info I had. I DO use size comparison where needed, so it apparently did not upload the photo. I'm sorry, I wish someone had pointed that omission out earlier I surely would have done one for sure! Only a few hours left now so sadly, its too late! These are about 3/4 the size of a dime, if that helps!
They were sent to me as genuine gems, and I have no reason to think otherwise. Although I didn't get any paperwork on them to know for absolute certain.