Double strand of Green Adventurine, Black Onyx Brass, and Glass/Jade beads. (1 is 16 inches and 1 16 1/2, the clasp makes it a little longer.) The beads have a goldtone loop and hook clasp, which makes the double strand. The larger green beads are 3/4 of an inch, and the brass 7/8 of an inch. The adventurine are approx 8mm. The necklace gives a 'Stunning' look, and the colors are super.