Once by Beaverbrooks. A new and exclusive diamond ring collection, Once by Beaverbrooks is a unique and special range of breathtaking diamond solitaires, perfectly matched with elegant platinum and 18ct white gold bands. Each diamond hand selected by our expert diamond buyers for its exquisite sparkle and fire, every ring in the Once by Beaverbrooks collection is completely unique, meaning your dream ring will be truly one of a kind.