Both were purchased at a pop-up shop in Shinjuku Lumine and are from artists. Neither has a hallmark, but both are made of silver. Simple ring: Purchased for around 2500 yen including tax Chain ring: Purchased for 6600 yen including tax The chain ring is an imported item and didn't have a size indicated, but it fit perfectly on my finger that usually wears a size 5 pinky ring, so I believe it's around that size. Please understand that these are used items. Thank you for looking.