Eccentric breast star "with diamonds". Most likely this is a modern "project" that was "build" by an enterprising fellow around original Russian-made central medallion. However, the possibility that this is a privately-comissioned piece made by unknown European workshop for an unknown cavalier (who supplied workshop with a Russian-made central medallion) cannot be completely ruled out (although the chances of this scenario in our view are just about zero). For comparison see https://asiamedals.info/threads/french-made-saint-stanislaus-order-breast-stars-with-diamonds.28565/
Silver, gold, gilt, enamel, strass stones.
Size 85.14 mm.
Weight 50.48 g.
Unmarked.
Almost certainly central medallion was taken from a Russian-made privately-comissioned breast star.
Central medallion under a different light.