I bought my lab grown diamond from a jewelry store.

I went in to buy an engagement ring and the clerk pulled out a few diamonds for me to look at, without telling me anything about them except that their prices were all similar.

I picked the one I thought looked the nicest (sparkly and big) and then the clerk told me about each of them.

The one I picked was lab grown. It was a higher quality diamond than the other two, and it was bigger, for the same price as a smaller, lower quality, "real" diamond.

(It wasn't a huge amount of money. Probably one or two hundred dollars.)

Diamond Foundry: https://diamondfoundry.com/ had a big marketing push a couple of years ago.

There's a number of stores on the internet that offer them. You just buy the diamond then have them set into a band of your choice.

I don't think large jewelry chains commonly offer them.

I wouldn't be surprised if their supply or natural diamonds was contingent on them not selling artificial ones.

Or maybe they're owned by the companies selling natural stones?

Wouldn't be the first time that someone tried to own the whole market from end to end.

Funny enough, but you can get them on Amazon. :)