We aren't prepared to guess what this gemstone is. We know it's not fake because it is cool to the touch. It's really quite nice. The beads are not round but flattened a bit. No need to double up this mala. It still has the full complement of 108 beads. Nice beaded work elsewhere especially on the tassels.
Be the Buddha, you can't have the Buddha, unless you buy it separately of course.