Ancient Sasanian Empire 1 white stripes engraved Carnelian ethical cultural 2 Beads / earrings,  each size 15mmx8mm, 4th-7th Century AD , in great condition. 

https://en.wikipedia.org/wiki/Etched_carnelian_beads

https://www.globalbeads.com/shop/etched-carnelian-strands/

https://artsofsoutheastasia.com/the-journey-through-beads-from-prehistory-to-the-pyu-states-in-myanmar/

中国国家博物馆考古出土天珠
http://m.tianzhu-wang.com/nd.jsp?id=19