Natural or man made

When you ask me if the stone natural or man made, all I can offer is an opinion, I'm not a gemologist, and there are some things no technology can help with yet. I use all the latest available technology to correctly identify all materials I work with, and have a long standing amateur expertise on the subject, and yet, I don't ever give a 100% guarantee. 

Of course another expert may tell you different, but they can just want to sell you their own stuff, or it is really their opinion. 

Of course even though I'm usually right there is always a possibility of wrong judgement.