Elegant Montana Sapphire Ring. The coloring of this teal-green Montana sapphire has beautiful depth. This beautiful 5.71mm brilliant round cut Montana sapphire has sparkles in all the right places. This teal Montana sapphire weighs in at .82 carats. We created this beauty 14K white gold. Montana sapphires are a 9 on the Mohs hardness scale, making this lovely ring extremely durable. Wear this Montana Sapphire ring for everyday or perhaps as an alternate engagement ring. Currently a size 6 3/4 but can resize for additional charge.