Various shades of blue briolettes making a pendant, on double strand twisted wire necklace of blue beads on gold plated sterling silver wire.. Extender chain allows you to wear this between 15" and 17." Now here is the thing- the briolettes appear to be a mix of blue topaz in various shades. The beads on the necklace - - I just don't know. They are such a pretty shade of blue that it didn't see to matter. Whatever it is, it adds a delicate flash of color. Cheering up your outfits without overpowering your own natural beauty.