Our Steampunk design, featuring a brass chain, toughened glass pendant with a Stainless Steel cap.
Tritium has a half-life of 12.3 years, meaning after 12.3 years the pendant will glow half as bright, and after 24.6 years will glow a quarter as bright.
Tritium costs $30,000 per gram, putting it in the top 10 most expensive materials in the world (of course it's in gaseous form in our pendants).