not sure carved jade things

i bought these at a antique jewelry store they sold them as clip on earrings but not just myself but others have never seen any clip on back like these...someone else said they think mayb era 1900-1920 coat button covers and since there was 2 would take it to that era for the coats that had only 2 buttons like ponchos and capes type...ANY help on what these really are and era would be WONDERFUL...
THANKS