Blue Mountain Jasper is considered to be one of the premium jaspers that has been a long time favorite with the lapidary community.  Known for its blue-green/gray orbs, it is a very hard material that takes a superior polish.  It also comes in other shades, mainly brown, purple and olive, and makes exquisite show pieces and finished cabs.   

Origin:  Oregon, US

Dimensions:  4.5" x 2.75" and approximately 8.4 mm thick.  Weight = 130 grams.

 Shown wet.  Not polished.  Known flaws are shown as white lines in the final picture.