Answer 2: The hardness of pure gold is 2-3. When real gold is carved with a metal needle (such as a pin), it will leave a clear notch. Folk goldsmiths often bite with their teeth. Judging the color according to whether you can bite or not also uses the principle of hardness to distinguish between true and false. I don't know if your ring is alive or the whole ring ... if it is alive, it will be easier to deform if the gold wall is thin! Downstairs is right. Avoid wearing expensive jewelry when exercising, bathing, sleeping and working! There is also playing mahjong! Throw away the card. Fingers flatten easily! The weight of polishing and cleaning is very, very small! Because the wear of itself during wearing will cause the loss of gram weight! The weight difference before and after washing is just dirt hidden in the gap of the ring. Never go to an informal gold shop for cleaning! In that case, it will really tear off your gold weight! More than 4 grams of rings, 1 gram and a half is not enough! There is no way to reduce the hardness of gold. If you don't pay attention to maintenance, those conditions mentioned above will definitely be deformed if you don't take them off! Platinum and K gold are relatively hard ... let my husband give me a replacement belt after my birthday. ...