The item is a green onyx silver bar necklace. The chain is a silver wheat chain that is adjustable. There is a silver ball at the end of the chain near the heart that slides along the chain to make it longer or shorter. The maximum length of the chain is 20 inches.The chain has a lobster claw catch. The silver bar has a green onyx "cylette" that measures 20 millimeters long. The bar measures 5 inches wide. The onyx looks real good in light , it looks like it lights up. The item weighs 5.3 grams. John Kennedy is the designer of the piece. He has given me permission to sell it. I will provide a pendant box.