It looks like this one 18th/19th century pectoral cross - http://goldenalley.ru/uploads/news/23/napersny_krest_p.jpg
Writings on top - "Mихаилъ/Гавриiлъ" ("Michael/Gabriel" - two angels)- old russian, but on your cross "ъ" letter looks like "z"
Unfortunately we've had to remove your question as it's not really a question about history.
Consider asking at /r/whatisthisthing, where this question is somewhat more appropriate.
