The Grau ring, an 18-karat rose gold jewel, is a testament to jewelry mastery and timeless elegance. What distinguishes this piece is its impeccable execution of the tubogas technique, a complex process that requires skill and precision. Tubogas, an Italian word meaning 'gas pipe', refers to the creation of flexible and intertwined bands of precious metal without visible welds. The result is a smooth and continuous surface that evokes movement and fluidity. In the Grau ring, two rose gold coils intertwine in a harmonious dance, creating a visually striking effect. This technique, although popularized in the 20th century, has roots dating back to antiquity. Etruscan and Roman artisans used similar methods to create flexible and durable jewelry. Today, tubogas remains a symbol of excellence in jewelry, appreciated for its beauty and technical complexity.