Sapphire is one of the Big 3 of jewelry gemstones—the other two are ruby and emerald. Sapphire is a durable stone that’s the best known blue gem, as well as being available in most colours.

The most highly valued blue sapphires are velvety blue to violetish blue, in medium to medium-dark tones. Preferred sapphires also have strong to vivid color saturation. The saturation should be as strong as possible without darkening the color and compromising brightness. JennyBay Diamond specialises in sourcing non-heated royal blur or cornflower blue sapphire for collectors.