Rose-gold ring with sapphire, engraved initials M.R.

I lost my rose-gold sapphire ring yesterday around 3pm near the Walmart on East Andy Devine Avenue in Kingman, Mohave County. It's a slim, unbranded ring, about 3.5 mm wide, with a bezel-set sapphire (roughly 4 mm) and a tiny diamond accent on the side. The inside is engraved with 'M.R.' and there's a faint nick on the outer edge from daily wear. It was a gift from my grandmother and has huge sentimental value—I'd really need to get it back. If anyone finds it, I’d be grateful to be reunited with it.