Wholesale I'm not sure. Retail you can use sites like stonealgo.com to search inventory. And no that's the final cut and graded price.

The trade uses a variety of sites for "wholesale" prices. Rapnet is the standard, and they publish the Rapaport Price List. However, it only covers natural diamonds, and rapnet only lists natural. Diamonds generally go for a % discount off the Rap Price List.

Polygon (.net) is the other major listing platform. They include lab diamonds, and most everyone uses them. There are other platforms, but those are the two majors IMHO.

You need to be a member of the trade to sign up AFAIK.

However, I have seen one retail site, Ritani, actually post "wholesale" prices and they seemed to be pretty accurate. They seem to have good prices too. They list their wholesale/markup/etc. Of course, you should buy from a nice local jewelry store, but if you want to buy lab online they are at least great for checking prices.

This is great. Thank you! Ritani is the one I was looking for.

LMGTFY

gemsny.com friendlydiamonds.com lightboxjewelry.com

I found a wide variety of 2-3ct diamonds for $1200-1400 there (round, brillant cut, the "classic" type), which is what a 0.75-1.0ct used to cost

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.