Prehnite and Matrix Faceted Rondelles measure approximately 7mm graduating to 10mm diameter in size, gemstones have a vitreous luster, the strand exhibits an excellent cut - polish - shape for a nicely made strand of well matched Prehnite beads, these bicolor beads are a transparent to translucent Prehnite of a soft, light lime green hue and an opaque Iron Ore matrix of a dark brown hue, and these Prehnite gemstones show a beautiful uniformity of color throughout the well crafted graduated diameters.