These are 10 mm x 8 mm calibrated oval red jasper cabochons.
Red jasper is a natural stone and is a member of the quartz family. It is brick red in color.
It measures 6.5 to 7 on the Moh's scale of hardness and is therefore suitable for all jewelry applications.
Photo is representative sample. Each stone will be unique.
Sold as a package of 10 cabochons.