This is one big Moonstone. On April 9, 2025, the students of Earth to Sky Calculus launched this premium pendant to the stratosphere onboard a cosmic ray research balloon. For more than two hours, it floated 102,800 feet above the snow-capped Sierras of central California.
 
The heart-shaped moonstone is wrapped in a sterling silver frame decorated with 18K rose gold-plated roses. It makes a great anniversary or birthday gift and comes with a greeting card showing the mooonstone in flight. All sales support the student's cosmic ray research program.