Mexico’s Libertad Enhanced With Diamond Dust And Black Ruthenium Ennobling. Like its predecessors, Mexico’s 2023 One-Ounce Silver Libertad coin features the iconic design that pays tribute to the Angel of Independence. But what makes this entry in the series so spectacular-and inviting to collectors all over the world-is the addition of a layer of actual diamond dust and selective Black Ruthenium ennobling! The contrast between the deep black background and the glittering highlights upon the central angel design is simply breathtaking.