GCI certificate on Catawiki

[IcePhoenix]

Hello pricescopers, I wanted to bid on some diamond jewelry on Catawiki. Certification coming from GCI laboratory. The seller is from Israel

I know Catawiki has had some problems with shoddy "certificates" from fake labs with emeralds and I was wondering if it might be the same deal.

Anyone ever dealt with this lab? Do you know if it is reputable or not?

Thanks for your replies and I hope you have a lovely and chill weekend