Opal is the birthstone of October, while they can be found across the world 95% of the world's supply originates from Australia. Opals are the gem of 14th wedding anniversaries and are a 5-6.5 on the Mohs scale.

There are five main categories: water opal, white opal, boulder opal, fire opal and black opal. Due to their softness, they are unsuitable for an engagement ring, or any ring to be worn every day as they are prone to chipping when knocked against hard surfaces. Utopian Creation's opals are sourced typically from South Australia and Queensland.