Watch a gemcutter work with fluorescent green hyalite opal

Steve Moriarty of MoreGems.com works with designer Christopher Michael to create beautiful faceted gemstones, like this hyalite opal that glows under UV light.

Rare, natural, and unique fluorescent opal cut and polished by Steve Moriarty. This gem is from Zacatecas, Mexico and came out to weigh 7.27 carats! It was cut into a shield shape. This faceted rock really glows in sunlight and direct UV light!

They can indeed be quite brilliant out in the daylight:

Glowing Gemstones - Faceting Hyalite Opal (YouTube / MoreGems.com)