It's the color of a sunburst: The Citrine X-Pendant. On Oct. 15, 2021, the students of Earth to Sky Calculus launched one to the stratosphere onboard an cosmic ray research balloon. At the apex of the flight it floated 120,892 feet above Earth's surface--a record high for our 10-year ballooning program.


The citrine gemstone is framed in a 18 K gold-plated swirl with a matching 16-inch chain. It is lead free, nickel free, and hypoallergenic.


The students are selling citrine pendants to support their cosmic ray ballooning program. Each one comes with a greeting card showing the pendant in flight and telling the story of its journey to the edge of space.

The X-Pendant