El Rey : Por quanto siendo conveniente, que el Oro, y Plata que se labre en alhajas, por pequeñas que sean, tengan la ley que la Moneda que he mandado labrar ultimamente, para escusar el daño que los Plateros que viven en Madrid en barrios extraviados ...

This document discusses how the silversmiths during this time were undervaluing jewelry just to make quick money. The King wanted to address this problem and make sure that the jewelry, gold, and silver were appraised properly.