Various colors of heated Missouri River sapphires, ranging from 0.16 to 1.65 ct. Courtesy of American Sapphire Company

Natural (unheated/untreated) sapphire crystals from an important historic mining area in the U.S., the Missouri River deposit of Montana, were added to the National Gem and Mineral Collection. The Missouri River sapphires have a total weight of 419.39 carats and are shades of blue and green in color. This collection of natural sapphire crystals of substantial size and fine color are a major upgrade to the National Mineral Collection.

Missouri River Montana Sapphire

Weight – 4.2 ct

Dimensions – 9 mm Depth – 6.72 mm

Treatments – none

Design – wlucky 4 trigon tilt 4 -by WahidMottaghian

Clarity – SI1

Blue, green, silver and gold in a large natural sapphire, mined and faceted in Montana, USA. Creative design and impeccable execution you can see from across the room. Nothing sparkles quite like natural, untreated Montana sapphire.