Renna 18-Karat Yellow Gold One of a Kind Surfer Girl Necklace. Hand-carved Mandarin Garnet, Pink Agate, Rock Crystal and Citrine Sea Creatures Adorn this Fanciful Treasure. We believe in the communicative and emotional power of jewelry. We are aiming to become the pre-eminant sustainable jewelryhouse of the modern era. We create jewelry that is unique and feels distinctly and purposefully yours. Sustainability: Recycled Gold. We use 100% recycled 18-karat gold and create each of our pieces by hand.