cairngorm

So called because found among the Cairngorms, a mountainous region in Scotland.

cairngorm (countable and uncountable, plural cairngorms)

1. A precious stone of smoky yellow-brown or gray-brown color, used in Scottish jewellery.
   • 1857, Thomas Hughes, Tom Brown's School Days, Part II, Chapter 6:

     And then he led away the talk to their home in Devonshire, and the red, bright earth, and the deep-green combes, and the peat streams like cairngorm pebbles, and the wild moor with its high, cloudy tors for a giant background to the picture […] .

• smoky quartz

• carroming