2023 Niue Black Pearl and Dragon Divine Pearls 2 oz 999 Antique Silver Coin. This high relief antique coin includes a real black pearl insert. It is the second in the series and has a worldwide mintage of only 500 pieces. Each coin contains 2 oz of. Mintage of only 500 coins. Comes in a box with a certificate of authenticity. Reverse: Features an image of a Chinese dragon with its magical black pearl. Sovereign coin backed by the Niue government. Auctiva offers Free Image Hosting and Editing. Auctiva gets you noticed! Track Page Views With.