9k Yellow Gold & 925 Sterling Silver Ring with Natural Cabochon Teal Tourmaline A little nostalgia with a whole lot of personality. The Gillian Ring takes inspiration from the mood rings we loved growing up, this time with a natural teal tourmaline set in 9k yellow gold. The stone's natural inclusions give it its own mix of color and character, while the wide 925 sterling silver band splits into two underneath the finger. It's a fun mix of metals, a one-of-a-kind-looking stone, and a childhood favorite all grown up.