That’s where Cubic Zirconium rings are born!
Not true Jack. The cubic form of zirconium is made by humans in laboratories. Gem zircons on the other hand occur naturally in several colors -- blue, white, yellow, red, etc. -- and the white ones were long used as diamond substitutes because of their "fire" and brilliance.
Zircon also has unique properties that make it very useful in dating ancient rocks. See Zircon in Geochronology