BOGO Silver layered necklace with green stone

2 layers of silver (don't think it's real silver). Longer chain is approx. 17", shorter is about 15.5". About 3.5" extender chain. Excellent condition, never wore it! Guessing on brand! BOGO FREE! Add 2 things to a bundle and offer or get an offer for the higher price item and get the second free.