10k refers to 10 karats of gold, almost certainly the cheapest gold alloy used in jewellery. It contains the least amount of gold, that's why appearing as pale yellow in coloration. M on a ring denotes Milor, that's an Italian silver jewelry company. 925 implies that the jewelry is fabricated https://cashndqdo.jts-blog.com/35794718/getting-my-jp88-to-work