Webster's Revised Unabridged Dictionary · 1913

Ouch

Ouch (ouch) , noun

[Old English ouch, nouche (a nouch being taken for an ouch: compare Adder), from Old French nusche, nosche, nousche, buckle, clasp, Late Latin nusca, from Old High German nusca, nuscha.]

A socket or bezel holding a precious stone; hence, a jewel or ornament worn on the person.
A precious stone in a rich ouche. — Sir T. Elyot
Your brooches, pearls, and ouches. — Shakespeare