This is a genuine Japanese 10 Yen coin necklace on a 20" black silk braided cord <3 I love to collect coins and make things out of them 😁 Each necklace is unique and features silver plated details. This specific coin is from between 1959-1989! It's made of bronze and bronze toned. Coin is made up of bronze, weighs about 4.5 grams (0.16 oz.) Check out Numista for more details-- I've included some screenshots from their site for informational purposes. Original necklace design, handmade by me! Of course, handmade can mean anything, but I source, identify, drill, and assemble each coin necklace myself <3