95.56% +/- 0.05 Platinum
4.44% +/- 0.05 Ruthenium
Ruthenium is the better metal for platinum to be mixed with. My fiance and I are very pleased with this ring.
We'd ordered a 0.75 ct. platinum eternity band from James Allen on sale (25% off) because it was the SAME price as this Brilliance 1 ct. platinum eternity band. We received both rings in the mail at the same time and they were VERY comparable. You could not see a difference, other than diamond size. We decided to keep the Brilliance ring and return the James Allen ring.
I hope this review helps somebody else shop for a beautiful wedding band!!