Green Montana Sapphire – Oval 1.63 carats. This oval, 1.38 carat green Montana sapphire from Rock Creek is a scarce find, featuring a light green color that is highly sought after. The cut of the sapphire has been optimized to ensure maximum brilliance, resulting in a gemstone that sparkles like a colored diamond. While there are some visual inclusions, they are unlikely to be visible to the naked eye. In certain lighting conditions, flashes of teal and green hues can be seen, while in others, you can admire a beautiful, even teal color.