@topper - these are fruits from my mom's lime trees. I don't know where she got the original stock from but she has propagated them several times now (by marcotting).
I put my watch there for scale. The diameter of my watch (inside face) is ~1 inch. The biggest lime fruit that I've seen my mom produce was ~2 inches in diameter. That was a rare one. Usually the fruits are 1.5 inches in diameter when mature.