Catherine Key CharmJade Trau catherine key charm in yellow gold. 18K Yellow Gold 0. 34tcw of 6 round, brilliant cut diamonds 1. 5 inch charm Handcrafted in 18 karat gold and featuring 6 round, brilliant cut diamonds, the Catherine Key Charm has become a staple in the Jade Trau collection. The sentimental design pays homage to the vintage charms of the Victorian era, but the addition of our signature matte finish keeps this piece firmly rooted in the present. The