Whole necklace and chain is made of solid 925 sterling silver. Weighs 26g or a little over.
Hangs 10.25" down from clasp, measures a little over 20" around/. Big opal is 1.5" x 5/8". Blue stones are about 7/16"x 7/16" or really more like 1/2" x 1/2". Piece at the bottom is I believe what they call Dichroic Glass in two different shades, a lighter and a darker, made to imitate opal stone.
It is really beautiful to look at the work of the artist who created this. It just has a very different look and is a real eye catcher. I can't find another like it.