"Australian-born, fine jewelry designer, Katherine Jetter, launched her collection more than 10 years ago. Inspired by her beautiful homeland, Katherine specializes in Australian opal and is affectionately known as the ‘Opal Queen’. As a Graduate Gemologist, Katherine also works with many other precious and semi-precious materials in her collection making the brand appealing to any discerning collector. She is well known for her impeccable eye for color, fresh designs in timeless settings, and an expert on investment grade precious gemstones. Katherine was named COUTURE designer of the year in her debut year. Her collection is exclusively carried by some of the best luxury retailers in the country. Additionally, Katherine Jetter owns The Vault, Nantucket. A couture jewelry store, which she has curated with some of the top jewelry designers and her peers in the industry. "