The ISAAC WESTMAN Black Onyx Necklace for Men is a classic strand of 8mm natural polished black onyx gemstone crystals on durable stringing with a sturdy sterling silver lobster clasp. The clean, masculine beaded design works for everyday or dressed-up wear and layers well; available in 16, 18, 20, and 24 inch. Black onyx is long associated with grounding and protection. Arrives in sleek packaging - an ideal gift for him for birthdays, anniversaries, Father's Day, or the holidays.