Art Deco Purple Marcasite top Necklace

top Pretty rich purple Czech glass Art Deco necklace that has Marcasite accents. One Marcasite is missing but can easily be replaced. Nice cuts to the Czech glass so it catches the light. Not sure if it is Sterling silver or silver wash over brass (I couldn't find any markings). Large 1.5” drop pendant surrounded by a sweet rose motif. Necklace length 16” inches not including drop, overall in great vintage condition.