This is a diamond ring from SUWA, a well-known, long-established jeweler that handles the finest diamonds! Size: 10 (Japanese size) SUWA products do not have a carat weight stamp, but according to a jeweler who resized the ring, it has a total of 0.8 carats. SUWA diamonds are of a very high level and are nothing to be ashamed of. Currently, band rings with melee diamonds are the standard, and large diamond rings like this are discontinued and no longer available. The structure appears to be from before the air setting. There are no certificates or other accessories, but it is authentic as I purchased it myself. It has a serial number and can be cleaned. Returns are not accepted to prevent replacement. Please consider carefully before purchasing, as this is a high-value item. I have listed SUWA products several times in the past. Suwa Trading Ginza Department Store Special Customer Sales Platinum Engagement Ring Madam Ceremonies and Events TASAKI MIKIMOTO Color: Gray系 (Gray-toned) Material: Platinum Ring Size: 10 (Japanese size) Stone: Diamond Diamond Cut: Round Cut Accessories: None Scratches/Discoloration: None