Jeweled Lily Knob in bright nickel with green aventurine semi-precious stone 1-3/8" diameter Product Specification: Made in the USA. Fine-art foundry hand-pours and hand finished hardware knobs and pulls using Old World methods. Lifetime guaranteed against flaws in craftsmanship. Exceptional clarity of details and depth of relief. All knobs and pulls are hand cast from solid fine pewter or solid bronze. The term antique refers to special methods of treating metal so there is contrast between relief and recessed areas. Knobs and Pulls are lacquered to protect the finish. Alternate finishes are available. Black Onyx Semi-precious stone. The name "Onyx" is derived from the Greek word onyx which means of a finger or claw . A Greek legend says that the Onyx stone came from Cupid clipping some of Venus nails. The clippings fell to the ground and were turned into the Onyx stone due to the fact that no part of a god can die. Onyx is chalcedony quartz that is usually found in Brazil California Uruguay and India.