Blue and Purple Boulder Opal Necklace-Australian Freeform Opal with Smooth 2.0mm Black Leather Cord and .925 Sterling Silver HardwareAs you can see from the pictures and video, this Boulder Opal is rich in deep and bright coloring of purples, blues with a touch of turquoise running throughout the ironstone matrix like rivers and lakes on a colorful map. Why settle for synthetic or lab created Opal when you can have a magical stone such as this that God himself created? All Genuine Materials: Australian Boulder Opal . 925 Sterling Silver Premium Leather Cord This is a smaller