Planning a surprise proposal? Getting the ring size right is crucial—but asking directly would spoil the surprise. Here are proven methods to find her ring size secretly. Method 1: Borrow a Ring She Already Owns This is the most reliable method. Find a ring she wears on her left ring finger Borrow it when she's not around (shower time works well) Either trace the inside circle on paper, press it into soap, or bring it to a jeweler Return it...