0.43 Ct. Greenish Blue Sapphire from Montana

From the ancient bedrock of Montana to the jeweler bench at The Natural Sapphire Company, this greenish blue sapphire carries a story written in time, pressure, and light. Formed deep in the earth over millions of years, this transparent 0.43 carat stone measures 4.90 x 5.06 x 2.79 mm, and it is fashioned into a crisp trillion shape that echoes the raw geometry of the original crystal. At eye level the clarity grades as very slightly included, a gentle reminder of the gem natural history that also gives each facet character and depth. The color intensity is medium light, a soft marriage of seafoam green and pale blue that evokes alpine lakes and high mountain skies. This sapphire has been heat treated, an enhancement that refines and stabilizes its hue while preserving the stone true to its Montana origin, and it receives an excellent polish that readies it to play with every source of light it encounters. When you hold it you can almost perceive the slow geological events that coaxed this delicate color into being, and you can imagine the careful hand that translated that raw beauty into a precise trillion, ready for a lifetime of wear.

The trillion cut of this 0.43 carat Montana sapphire is a small sculpture of light, each facet cut to harness brilliance and to reveal the gem inner personality. Under bright natural daylight the medium light greenish blue reads as a clear, cool aqua, the transparency allowing light to pass through and reflect back as lively scintillation from the pavilion facets. In the softer, diffuse light of an overcast day the stone takes on a serene, watery tone, the blue and green components harmonizing to create a tranquil, almost ethereal glow. Under incandescent light, the warmer spectrum brings forward the greenish nuances, creating a more intimate teal impression with flashes of soft brilliance along the trillion edges. In candlelight or warm ambient indoor lighting the stone offers a quiet, reflective shimmer, small points of light dancing along the facet junctions rather than overwhelming sparkle, a quality that makes it particularly charming for evening wear. Because the clarity is very slightly included at eye level, there is a natural depth that interacts with directional light, producing subtle internal reflections rather than large visible imperfections, and the excellent polish ensures those reflections are crisp and lively rather than dull. The heat treatment brings out the stone best tones while maintaining the natural character that collectors and connoisseurs love about Montana sapphires.

This sapphire is an ideal center for a delicate ring, a petite pendant, or as an unexpected accent in a bespoke three stone design, and The Natural Sapphire Company can advise on settings that will best showcase the trillion form and its color story. An open back setting allows maximum light to travel through the pavilion and will emphasize the aqua brightness in daylight, while a bezel or closed setting creates a more intimate presentation that enhances the teal hints under warmer lighting. Set between white diamonds, the greenish blue will appear fresher and brighter, set against warm metals such as yellow gold it will show its green side with more presence, and set in platinum it will read as a cool, classic aquamarine like tone with modern sophistication. Because the stone is heat treated, it is stable for everyday wear, and the excellent polish means the surfaces will reflect light cleanly for years to come with routine care. At The Natural Sapphire Company we celebrate the journey of each gem from its geological beginnings to the finished jewel, and we are happy to help you choose the perfect setting or create a custom design that lets this Montana trillion sapphire tell your story, glowing differently with every light it meets.