Moisonite or however it is spelled looks too green... There is a really a very good simulate called Asha.. it's even slightly tinted to look more real. . .
http://www.goodoldgold.com/ buy from these guys
They know how to cut stones, and don't generally sell shit. Good prices too, very good.
If you just walk into some mall or regular retailer, you're not coming out with your ass. The markup is huge on the garbage they sell and they pay their stooges 1% commission if any for raping everyone. Fuck their IGI certs and all of that shit. Look for GIA or AGS certs- good shit.