Prehnite and Matrix Pear Briolettes measure approximately 20x12mm to 29x12mm in size, have a vitreous luster, have an excellent cut - polish - shape for a nicely made strand of well matched , the bicolor beads are translucent Prehnite of a medium lime green hue and an opaque, dark brown Iron Ore matrix creating a `Mint dipped in Chocolate` look to the gems, and each strand of approximately 14 beads will reflect the unique features of this lovely gem.