Purchased from a boutique in Fukuoka Prefecture. I haven't used it in a while, so I'm letting it go. Size: US9.5 (Size 21) Yellow Gold AU750 stamp; please check the photos as the stamp is small. I no longer have the original box or certificate of authenticity as I threw them away. I have two Tiffany rings for sale. The first person to purchase one (up to payment completion) will receive the box and bag from when I purchased a silver product. Please let me know if you don't need them. I am not always able to check Mercari, so please understand that I may not be able to update the page for a while after a purchase. - Brand: Tiffany & Co. Yellow Gold 18K - Design: True Wide Ring - Stamp: Tiffany & Co. au750 Thank you for looking.