For those wanting a genuinely unusual and dramatic engagement ring, nothing beats a bombe. A curved shape defines this Art Deco style; its name comes from the French word bombée, which means ‘domed.’ Because they use more metal than other styles, a bombe engagement ring is usually flush or French-set with many stones of different sizes to create a clustered effect. A combination of diamonds and color gems like sapphires and rubies is a standout choice for a bombe ring.