Zircon’s typical greenish blue color has been referred to as zircon blue. - Lydia Dyer, gem courtesy of John Dyer & Co. Zircon is a gemstone that’s not commonly known among jewelry buyers, which is a ...

Luckily, science has had some help from a super blue speck of zircon dated to around 4.4 billion ... than 4.3 billion years old is extremely rare, making the Jack Hills find all the more significant.