A huge, oversized glass Christmas ornament, on average about 200 millimeters in diameter. Commercially available in specialty and big-box warehouse stores, and almost exclusively bought by shopping-mall holiday decorators and people with 50-foot pine trees in their yard.
A combination of Gorn (as in the Lizard People on Star Trek) + ornament.
I need 30 4-packs of gornaments. They're for the story-high wreath behind Santa's throne at Briarwood Mall.