This orbicular wonder, yes, I love me some orbs, is a Galaxy Rhyolite in grey and yellow tones.  I fabricated a hollow form to follow the shape of the stone and imprinted an orbicular pattern in the sheet metal to mimic the pattern in the stone.  This is a stunner in person.  Length of necklace is 24" including the pendant.  Pendant alone is around 1 1/4".  Chain is a sturdy sterling silver curb chain with a lobster clasp.