Go direct to the source and you can get 2ct colorless diamonds at less than $600 shipped. e.g., https://detail.1688.com/offer/751071300271.html

There are literally hundreds of suppliers like that in China/India. Do not pay more than $1000 for a diamond of any size.

This looks too good to be true. I am interested in this (because of all the terrible stuff related to diamond mines), but how do you protect yourself from scams on this site? $500-$1,000 is a lot to "test the waters" and see if they are real or even if they will arrive. What is the chance the just swap it out with Moissanite or who knows what?

Link is not working, can you tell me what to search?

Go to 1688.com and search "实验室钻石" -- "lab diamond"

You may need to have an account. But there's a ton of interesting and esoteric stuff on 1688.com, so, if you can figure it out, it's worth it.

Works for me.

I get infinite captcha hell.