Daniel.diamonds sells clarity enhanced and "natural" loose diamonds on Ebay. Look very carefully at all their feedback because many people leave negative feedback about the diamonds being nothing like described, but under positive or neutral feedback. Personally I have bought several diamonds that have been completely not as described with much lower color and clarity grades, off completely in size and measurements, and one that was supposedly natural clarity and fancy yellow that was clarity enhanced and a light yellow, not fancy (supposedly heated but who knows).
He frequently sells diamonds that are not as described and issues partial or complete refunds. Just look carefully at his feedback- ignore the items that are for a small amount of money and look at the larger diamonds. This can be a complete waste of time for those who do return items. A lot of people don’t mind the enormous inaccuracies in his descriptions because some people are uninformed and sometimes the diamonds are still good value but some are total junk or people expected them to be as described.
Since the diamonds are not just off by several color and clarity grades, but are actually totally off in size and measurements, the stones he is listing are not actually the ones that he is sending. It seems that based on the final price paid they try to very roughly match a diamond they have in stock so you really aren't bidding on an actual set diamond at all. The only thing remotely similar may be the shape and colour (yellow, pink, blue) but all white or off white diamonds seem to be top light brown or faint yellow.