Vintage Sarah Coventry Faux Pearl Gold Tone Diamond Shaped Pendant 18” Debutante Necklace Princess Length. Very nice vintage necklace. In good vintage condition may show some signs of wear due to normal use. The name of the necklace is Debutante. Sarah Coventry introduced it in 1962. There were also clip earrings to match. The best book for research is "Identifying Sarah Coventry Jewelry 1949-2009" by Sturdivant and Crabtree.
This item is on page 46. I was given this information by a lady whose family worked for Sarah Coventry from 1958-1978. Measures 16 inches with just the chain and 18 inches with the Pendant. Shipped with USPS First Class.