Material: Alchemia by Charles Albert (see description below) Stone(s): 1 genuine ark shell Overall Dimension (including bail): 1.75 x 1.35 x 0.5 inches Inner Bail Diameter: 8 mm Weight: 13.6 grams Stamp/Mark: Charles Albert Serial Number: p32605 Charles Albert is a brand celebrated for its innovative designs and high-quality, handcrafted jewelry. The newest collection, Alchemia, is inspired by the ancient mythical craft of transforming lesser metals into gold. Similarly, Alchemia fuses a secret blend of elements that when combined simulate the look and feel of 18K gold. This alloy is nickel-free, lead-free and a cost effective alternative to precious metals. It will not tarnish. All Charles Albert creations are one-of-a-kind, encouraging the wearer to express his or her individuality. Shells are mineral structures formed by aquatic creatures and land mollusks. Lustrous shells including mother-of-pearl have been carved into cameos and buttons since antiquity. The beauty and variety of shells make them a sought-after decorative material.