Opal Engagement Rings

At 5.5 to 6.5 on the Mohs scale and containing water, opal is a stone for protective settings and occasional wear rather than a daily engagement ring. Every opal ring here can be made in platinum, 18ct or 9ct gold, with diamond accents or without. If you are torn, compare our diamond engagement rings, or read how to choose an engagement ring in five steps. Every ring is ethically crafted with transparent pricing and complimentary resizing for one year, backed by free, no-pressure advice from our London team.