A common and highly sought-after Van Cleef & Arpels black and silver-toned necklace is a piece from the iconic Alhambra collection.  Here is a detailed description: This type of necklace typically features the signature Alhambra motif, a four-leaf clover shape that is an emblem of luck for the Maison. The striking contrast is achieved by pairing black onyx with a "silver-toned" metal, which in Van Cleef & Arpels fine jewelry is generally 18K white gold (or sometimes platinum/silver accents in certain pieces). Black Onyx: The motifs are inlaid with a deep, jet-black, polished onyx stone, which provides a sleek and sophisticated presence. These necklaces are available as single pendants or as long station necklaces featuring multiple motifs spaced evenly along the chain (e.g., 10 or 20 motifs). The long necklaces are prized for their versatility, as they can be worn long, doubled, or even layered with other pieces.The combination of polished black onyx and the luminous white gold creates a timeless, elegant, and refined look that is suitable for both formal occasions and sophisticated daily wear. It is a piece distinguished by its unique, timeless elegance.