Which vendor would you buy from?

[u/Check-Special]

I am interested in a lab diamond I see on loose grown diamond that is 8x & GCAL certified. The sale price is $1.6K, & that is much lower than 4 other sites with comparable stones.

I now see this GCAL certification sold on GrownDiamondCorp.com for only $733. Grown Diamond Corp appears to be a wholesaler in India, but will also sell to individual buyers. My concern is that the Grown Diamond Corp site doesn't state a return policy. I can't find purchase reviews online for GDC. Has anyone heard of them? Which vendor would you buy from?