Gold medallion statement necklace

Necklace of 5 gold tone medallions. This is a hefty one at 3 oz. A real statement piece! Unsigned. Materials unknown, possibly brass due to color and weight. Finish is a muted matte gold tone. Linked together by flat curb chain links. Lobster clasp in back. Adjustable from 17.5" to 20.5", but most balanced at 17.5". Weighs 3 oz / 87 grams. Largest medallion is 2" across, medium 1.5", smallest 1.1". They are all three dimensional and 1/4" thick. Excellent condition. I can find no flaws. Comes from smoke-free home. Offers and questions always welcome.