$172 14K Yellow Gold Clasp Estate Necklace with 14K Beads Marked 14K DM 585

This piece is a puzzle that I have not solved It is Very Attractive The necklace features not only a 14K Yellow Gold Clasp, but also 40 small 14K Yellow Gold Beads It is Fairly Lightweight My question to myself is what the Black & Silver-Green beads are The Black are most likely Black Jade; explaining the lightweight of the necklace The Silver-Green beads are a real puzzler Necklace has a Total Length of 18 inches Both the Black & Silver-Green beads measure 5/8 of an inch Round However you look at it, or think of it, it makes for a Pretty Color Combination Priced to Sell for $172 from the Genuine Stoner Closet