Lovely Natural Agate Druzy Geode with silver etched pattern on tips,
druzy is bezel set, silver is pinched around by hand.
Circa 1970 - 80's, 
silver, clip on back allows the lanyard (36" red & black leather) 
to adjust stone to desired length.    
The tie measures approx. 18 inches long, the setting measures approx. 2 1/2" X 2" X ½", 
tips measure approximately. 1" long.  
Please view all pictures since they describe much better than words!
I described this to the best of my ability.  It was handmade by my son-in-law's grandfather.