Unmarked Necklace - Yves St Laurent, Christian Dior, Etc. Style Vintage

This gorgeous necklace was acquired in an estate lot of high end pieces. I cannot find any markings or stamping other than the two arrows on the chain links. Research is showing it as a close match to many Christian Dior and Yves St Laurent Vintage pieces but no exact match found. Selling this as is, as shown, and without guarantee to maker. Priced appropriately given it is not marked or confirmed to be designer. Gold and diamonds have been tested and showing as costume (gold tone and not diamond) Clasp closure is fully intact but needs slight adjustment to stay closed. If authentic, this piece is a huge deal! PP11