Studio Bille Billie NecklaceStudio Bille Billie Necklace. Billie is a slightly bolder classic with a larger pearl Made using a traditional knotting technique with a double knot between each pearl to protect the surface from scratching. Handcrafted in Norway Natural freshwater pearls 925 Sterling Silver Approx. 42 cm in length Studio Bille Studio Bille is a small Norwegian brand founded by Maria Undheim that began with the signature take on simple, classic and timeless styles.