4 Stone Stacker Ring - 512Express Yourself with these Sterling Silver Stacker Rings with Genuine Kingman Turquoise or Howlite! Perfect to wear alone or stack together to make your own unique statement. Sterling Silver is durable, hypoallergenic, affordable, and has positive effects on body heat and mood. It's also long lasting, allowing for trendiness on a budget and potential family heirlooms. Howlite enhances memory and learning while promoting calmness and balance in the