A deep blue glass ball with a mirror-bright surface and an oil-slick sheen across it, so the blue breaks into violet, green and gold as it turns. It reflects the whole room, lights included, which is why one of these reads brighter than a dozen flat ornaments around it.

About 3 and a half inches across. The hanger is a loop pulled from the glass itself at the neck, no metal cap, finished with a sheer white ribbon. It suits a navy and silver scheme, a peacock palette, or a plain green tree that needs one cool, glossy note.