Custom Jewelry Design Marona Diamonds has the greatest team on Earth. They love what they do and offer an incomparable level of custom-jewelry design and service. High Quality Rare Diamonds Our specialty is high-quality rare diamonds. All of our diamonds come with an independent lab certificate and a written guarantee to be conflict-free diamonds originating from ethical and socially responsible sources. Passionate Customer Service We strive to create a fun and memorable shopping experience, while maintaining our reputation for consistently superior diamonds, exquisite designs and impeccable craftsmanship.