A kind of quartz and a variety of chalcedony, blue lace agate is well-known for its eye-catching light blue and white bands. Crystal expert and Energy Muse co-founder Heather Askinosie claims that this particular crystal is extremely uncommon and can only be discovered in one particular mine in Namibia. Blue lace agate is extremely calming and one of the rarest gems on Earth, which makes it a great pick when you're feeling overwhelmed or stressed. According to Askinosie, it promotes mood elevation, self-soothing, and a return to a state of serenity.