Inflation is probably why the number is higher now.

A year ago I picked up a 1ct hearts and arrows (D/E. VVS1/2, IGI certificate) from AliExpress for $360. I can see the hearts and arrows and it tests as diamond. A few months later an article came out about how lab diamonds stack up against mined, and the author had also bought one with similar characteristics from AliExpress for even less.

I just checked the same store and they're (not H&A but same other stats) running around $125 plus a $14 tariff.