This 38ct Large and in charge geological beauty is Australian Boulder opal. This piece is sure to make a statement when worn displaying deep blues and green accross the entire face of the stone. Set with a .925 sterling silver bail and your choice of optional .925 sterling silver plated snake style chain 1mm. Measurements: 31mmx27mmx5mm With bail 31mmx39mmx5mm key: Widthxlengthxheight I cut, shaped, polished, and set this gem for a necklace from a rough boulder opal stone. I ship everything from my home in Colorado next day. Comes in Elegant floating display holder perfect for gifting. No treatment. Stone is all natural. NOTE: 0 inches option is for the pendant without the necklace.