Purchased a very expensive sapphire on Catawiki. The item arrived and the colour of it looked NOTHING like the pictures. I called the customer services team who then asked me to write to them, as the item was of “high value”. So I did. I wrote saying I suspected that the item received was not what was listed and even sent photos. The “customer services gem expert” essentially replied and said they could not do anything about it and the sale could not be cancelled. I contacted the seller who was willing to accept a return, but because Catawiki refused to cancel the sale (they get to keep the auction AND commission fees, making a tidy sum of over €1100 for DOING NOTHING). Never again. Buyer beware. This site is a major con job.