Prehnite and Matrix Pear Briolettes measure approximately 24x10x4mm to 37x14x5mm in size, have a vitreous luster, have good cut - polish - shape for a nicely made strand of well matched gemstones, the bicolor beads are translucent Prehnite of a yellowish green hue and an opaque Iron Ore matrix of a dark brown hue, and the unique 2 tone feature within these beads is assorted for top and bottom coloration.