I thought this stone had a wonderful contrast, so I made a boulder opal with half opal and half matrix in a hexagonal shape, and created a matching silver setting. There are four holes in the back for a chain. The position of the opal and matrix will change depending on which hole you thread the chain through. Although small, it's a blue-toned opal with good play-of-color from any angle. I wonder which pattern will suit you best today. I hope you enjoy wearing it. Materials: silver925, natural opal Rhodium coating is applied. The shine will last without polishing. The holes are large, so thick chains and leather cords can also be used.