Our Adelie Penguin earrings have ear wires made of solid sterling silver and feature genuine Swarovski crystals. Cloisonné jewelry is handcrafted by fusing kiln-fired glass to a sterling silver foundation, and each color is outlined by a fine braid of silver wire.  The 1" tall earrings are enameled on both the front and back which strengthens pieces and makes the backside smoother to the touch. Lastly, these earrings from Bamboo comes packaged in eco-friendly bamboo gift boxes lined with anti-tarnish fabric.