Mt. Fuji Gold ring, yellow and white, and 10K gold with BIG unknown stone!

The Mt. Fuji ring was made by the night shift male RN at Sutter Center for Psychiatry in Sacramento. I worked evening shift. I gave him a huge University gold ring and the white gold is from a small bent ring my mom gave me. I also traded him opals and he made me opal ear rings and big pendant with opal. I gave him all left over gold and a bunch of opals. I was in Mexico and this couple were going to Magdalena (opal city,area) in Mexico. Their kid did not want to go so he stayed on beach with me. I taught him to fish! Well his parents gave me about 30-35 opals for I guess babysitting! Unusual to leave 10-11 yr. boy with man you do not know, but hey they trusted me and we had great fish dinner, fish caught by kid when they returned. The 10k ring has huge stone, but I would like to know what it is!! I will give T. Fuji ring to son as he is 1/2 Japanese! Don