The shape of the woman's thighs remind the speaker of a beautiful precious stone that a skilled workman has carved. Alternate translation: "The curves of your thighs are beautiful like the beautiful curves of jewel that a skilled craftsman has made" (See: [[rc://en/ta/man/jit/figs-simile]])
The hands are a synecdoche for the person. Alternate translation: "the work of a master craftsman" or "something that a master craftsman has made" (See: [[rc://en/ta/man/jit/figs-synecdoche]])