The double strand necklace clasps in back and the center stone hangs at a 16” chain length with the briolettes dangling below. The 8mm center stone is available in all colors in the photo, as well as natural white topaz (clear). Briolettes are synthetic and available are pink, ruby red (pinkish red), dark blue, orange and green (please note that this green is a blue-ish, grey green and does not match either the peridot or emerald green but looks great with both). Faceted clear crystal quartz (natural) briolettes are also available. Please specify color choices when ordering.