Gorgeous platinum engagement ring with a 2.56 carat lab grown solitaire diamond!

My brother's fiance had a change of heart, but his loss is your gain! She only wore this ring for a few months. Included is a Tiffany box since the original was lost. I also have the receipt, diamond certificate, and appraisal from 2021. It says 5.75, but it was actually sized to a 5.5. Please let me know if you have any questions!