This setting was sold to me as a size 6, but I believe it's a size 5.5. I bought it to fit a round colored stone I have, but it's just a bit too small (the crown of my stone is rather high.) I believe it could fit a size 5mm stone/diamond just fine.
The sidestones are about 0.25cttw (around 0.10-0.12cts each.) They are white, bright and cut fairly well, along with eye clean. Under my 10x loupe, I can see a small inclusion in one, whereas the other is cleaner. I'd rate them SI1-2 in clarity to be on the safe side. The ring weighs 3.3grams. The inside is hallmarked PLAT and 18K.
I'm Xiriah on the forums and have sold on here, DiamondBistro, Etsy, and eBay before. Please keep in mind that this is a final sale. I accept payment through Paypal and shipping within the US is included in the price. If you have any questions or would like to see more photos, feel free to message me and thanks for looking! :)