Catbird Lover's Ring in Gold - FIRM PRICE or TRADE

LOVER'S RING ONLY (other ring on sizer for display) Just bought this off Poshmark listed as a size 8 when it's a size 9.5 - I'm so sad because I've been wanting this ring for ages. Unfortunately I accepted before investigating the case so I'm trying to get my money back. OR I'd trade with someone for a different sized Lover's Ring!