Something uncommon and beautiful is created in the Astrophyllite Gemstone. Astrophyllite is a very rare, brown to golden-yellow gemstone. This necklace has an s hook closure which is adjustable up to 19 inches. Stone is 1.75 x .75 inches. Lentil shaped element is 1 inch across. This necklace has it all-simple elegance, natural surface contrasting stone, and adjustability!