These are our special, custom grown cerium YAG with orange fluorescence.
This material was custom grown for us in an attempt to make an ultra-bright cerium yag formulation. Our first one succeeded, but subsequent ones have had an odd result, instead showing normal (exceptional) brightness but an orange fluorescence rather than greenish-yellow. These stones are still very beautiful though, and their unusual orange fluorescence gives them a unique look. Note the orange shows best under 365nm UV--395 will generally just show yellow.
Cerium YAG is known for its exceptionally strong yellow fluorescence paired with its canary yellow base color. It was actually first used as a gem before its scientific potential was recognized, leading to the development of technical-grade formulations with even brighter fluorescence. Today it is widely used as a phosphor in LEDs, absorbing some blue light and emitting yellow which can turn a blue LED into a white one.
