Three diamond rings stacking size 7.25

Three diamond rings. I purchased these and they were 595 for the set of 3. I cannot remember if they are plated sterling silver or if they are gold. Given the price I paid, I'm guessing gold but pricing them at the sterling silver level so someone could be getting a steal of a deal! There is a rhodium plated, a yellow gold plated & a white gold or palladium plated? Diamonds are authentic, they have a rustic feel to them and stack nicely together, but would hold their own individually as well. Sold individually, just let me know which one you want.