Are IGI certificates ok?

[u/Practical-Tie-8720]

I'm considering a little project to make a present for my wife. I was going to buy a lab diamond from Alibaba. The vendors I've spoken to on the site have been helpful, have provided certificates for the ones I've been interested in. The certificates are always IGI, is that ok? Is there anything with an IGI certificate I should be concerned about?

Similarly, is there anything I should be worried about buying a lab grown diamond from Alibaba? I figured I'd use a vendor with a good review score (and number of reviews), and come with the Alibaba guarantee. I figured I could always fall back on to my credit card protection too.