The catch is that the seller has not identified the laboratory that has graded the diamond. This seller identifies other stones in their inventory as "GIA certified" or "EGL-USA certified", so we have to assume that the lab in question is less reputable than EGL.
I see a SI3 label on clarity and that means I'm already guessing that it is an EGL international graded stone (not EGL USA). If the image on that listing is correct, it looks terribly included.
If I were you OP, I would take a look on Blue Nile given that I'm guessing that you are based in Ireland from your mobile phone carrier. They should have all-inclusive pricing of VAT and duties and their inventory will definitely be better than that eBay seller's! Just search for stones which have videos on the listings.
I would not touch this diamond with a 10 foot pole. The clarity issues (inclusions) make this stone very unappealing. As another poster mentioned, if it is EGL graded you can knock it down a few grades in color/clarity to compare to GIA.
Start a new Post listing your budget and desired specs and people will search for stones for you. Probably aren't going to get a colorless, eye clean, 8 mm stone for less than $10k. You might have to tweak your expectations or budget. Or both.
Is preloved an option? Mention that in your post, too.
People here are great at sleuthing the interwebs for diamonds.
If it were graded, even by EGL Europe, it would be SI3 OR I1, not SI3-I1. So it's apparently graded by the seller, which might be good but is probably bad. It looks like it's about to fall apart. At I2 or I3 that can be a real problem.
A lot of e-Bay stones end up there because they are so bad that not even low end mall jewelers want to sell them. They aren't interested in having fiances walk into their showroom with hunks of diamond.