The round cabochon of Bruneau jasper measures 29mm and is just under the size of a fifty cent piece (30.5mm). The cabs have been handcrafted then tumbed polished the last few steps so that the cabochon is polished nicely on both sides.  If you like large earrings, or a nice pendant, these would be great! Bruneau jasper is classified as one of the top five jaspers and is hard to get except from old collections. Just a few cabs left but all very nice. The cabochons came from an old collection from the 50's.