United States Capital 100 grams 0.999 Silver 4 Layer Coin. This is the 3rd issue of the successful “4 Layers” series. It is dedicated to the Capital Building of the United States in Washington D. This coin has a diameter of 55 mm, uses the “4-layer” minting technique which achieves a depth of up to 5 mm. It consists of four different depths creating a three dimensional effect! Metal: 0.999 Fine silver. Features: Concave “Four Layer” minting technique. 5mm Ultra high relief. Year of Issue: 2017. Weight: 3.22 Troy oz (100grams). Box and COA: Yes. Otherwise, I may need to cancel the order. All pictures in my listings are using Stock photos except where noticed.