i know this sounds like a really stupid answer, but have you tried turning the ring over, and reading it "upside down" because that could in fact be the right way up.... i thought my ring said "526" and then i turned it upside down and realised that it was in fact 925..... look at the 2 in the middle and try and see what way up it is meant to go.... that's the best answer i can give, hope that helps in some way Answer 2:
Normally those numbers (on any jewelry) are the quality and or quantity of precious metals involved.
you.ve looked at it upside down...925
34% of 526= 34% * 526= 0.34 * 526= 178.84
5% of 526= 5% * 526= 0.05 * 526= 26.3
The factors of 526 are: 1, 2, 263, 526.
526 = 1 x 526, 2 x 263.
the half of 526 is 263.
526 = DXXVI
526 = 5.26x10²
1, 2, 263, 526
526 * 22 = 11,572
1226
6 x 526 = 3156
263 x 2 = 526