This untreated Montana sapphire is a genuinely unusual stone, exhibiting a strong color change that makes it difficult to assign a single defining hue. Under most lighting conditions it presents a rich blue green, but in sunlight it shifts decisively toward a bluish violet — a dramatic and relatively rare phenomenon in Montana sapphires that gives the stone a different character depending on where it is worn and viewed. Clarity is exceptional for an unheated Montana sapphire. The stone is eye clean, with only a few very fine strands of silk visible under magnification that have no impact on its face-up appearance. Brightness is moderate, a natural consequence of the medium dark tone rather than any internal interference, and scintillation is excellent — the pear cut delivers lively, well-distributed light return. Collectors and buyers seeking something genuinely distinct will find this stone hard to overlook.