I bought a ring with tanzanite (lot 41497201) and since it's half lockdown I didn't wear it immediately and I'm not a really look well on it when I received it (also I had trust to catawiki and thought that they have checked it). Anyway around 6-7 days after I received it I found a chip on the stone (a little piece on the side was missing) it was 04.11.20. I made photos and wrote to seller but couldn't attache photos on the platform of Catawiki. Seller answered to me that it's an inclusion (I understand what is inclusion and it's not). So I wrote in support with all photos attached. Passed around 4 days and no answer. I wrote again. And than I decided to change my review on catawiki site (I thought it will help to get some attention to my problem). Meanwhile I found on the photo of the lot the same chip but in the description - nothing only excellent condition and on certificate no mark about any damage. From catawiki I received this: In addition, when you contacted us, your picture attachments also cannot be opened (we also see that the seller is mentioning the same issue). Therefore, we are also not able to have your item re-evaluated by our experts. Seeing that this item is not re-evaluated, we also would like to kindly inform you that we have to remove the feedback you left for the seller. So they didn't ask me to send them photos again! But just changed my review from negative to neutral (at least not good!) and I can't change it anymore (by their rules I have 90 days to do so). And the seller put as a response to my review this: I am very sorry that after a month you think otherwise, first a good evaluation and a month a bad evaluation. Since you do not understand precious stones, I explained that natural stones have natural inclusions, that they are not crystals. Explained in the description of the article and in the IGI Certificate of the stone. You hurt serious sellers, more than 4 years selling on Catawiki and 100% good valuation. They said about after a month - first review was from 31.10.20 and second on 09.11.20 so it's the first lie. And than she keep saying that I don't understand stones - maybe but I think even a child can understand the difference between inclusions and a little hole in stone. If you will go to this lot (I wanted to put a link but it's not possible) and make the main photo big you will see it on the left side a little bit under equator of the stone. On this fact not catawiki's support neither seller doesn't answer and by mysterious reason none of my photos is possible to see! And only after bad review on the site support answered me on the second!!! email. What a mystery! I'll never ever suggest anyone to do any sell or buy with this horrible service. The worst of all. And they get 25% fee in total from the buyer and seller! I'm just happy that my experience was not very expensive. No trust to this company of the thiefs. I'm sorry for my english and the expressions but it's so disappointing!