It's some kind of modern interpretation of the ancient necklace called "grivna". Usually it's a metal jewelry in the form of a rigid hoop. At different times in different cultures it was called: torque, pectoral, lunula. The “tsata”, decorative element of ancient Russian icons, is derivation of grivna as well.
Jewelry are made ​​of stainless steel with the mirrored surface. 
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