Steampunkers USA Stone Wheelies - 30mm Offset Black Onyx - 20" to 24" Adjustable Soft Black Poly Woven Washable Cord - Smelt Crystal Gemstone Collectibles Carved Necklace Handmade Charm Stone Type: Onyx Agate. Color: Black. Approx. 30mm Diameter Description: Donut Shaped Gemstone with 20" Adjustable Cord Necklace. Gemstone Symbology: Onyx # Loyalty, Determination, and Concentration Includes Adjustable 20" Black Necklace Cord as Pictured Stones may vary slightly in size, color, pattern, or shape. The item sent to you will be similar to the one picture first.