1.55 Ct. Color Change Sapphire from Tanzania

This stone is a transparent one point fifty five carat oval shape color change sapphire, measuring seven point five eight by six point one six by four point zero three millimeters, cut in a mixed brilliant style with an excellent polish. Its clarity is described as very very slightly included when evaluated at eye level, which for practical purposes means the gem is effectively eye clean and the very small internal features are visible only under magnification, not to the naked eye. The medium color intensity gives it a well balanced tone that reads neither washed out nor overly dark, preserving both vibrancy and light return. Importantly, this sapphire is natural and has no enhancement, a factor that significantly increases desirability among discerning buyers who seek untreated material. The gem originates in Tanzania, a region known for producing a variety of distinctive corundum material, and the provenance contributes to the story and collectible value of the piece.

Optically this color change sapphire stands apart from more common gems because of its ability to shift hue under different lighting conditions, showing cooler bluish lilac tones under fluorescent or daylight conditions and warmer violet nuances under incandescent lighting. That behavior derives from selective absorption related to trace elements in the crystal structure and the pleochroic character of corundum, and it is accentuated by the mixed brilliant cut which combines a faceted crown designed for sparkle with a pavilion geometry that preserves color depth. The gem has an average face size that balances spread and depth, with the four point zero three millimeter pavilion depth amounting to roughly fifty nine percent of the average of the length and width, a proportion that promotes strong light return without sacrificing face up surface. When comparing brilliance to more common gemstones, sapphire does not exhibit the same high refractive index as diamond. Diamond refractive index is two point four two, sapphire is about one point seven six, and because of that diamonds will show more fire and scintillation. However, where this Tanzanian color change sapphire excels is in its saturated, shifting color and its lively facet reflections, attributes that produce a different, more nuanced type of brilliance that engages with changing light in ways that single tone crystals do not.

For the educated buyer this sapphire represents a compelling combination of attributes, qualities that The Natural Sapphire Company highlights for collectors and fine jewelry clients. The no enhancement status preserves natural rarity, the very very slightly included clarity assures eye cleanliness which maximizes face up brightness, and the medium color intensity together with the mixed brilliant cut yields a stone that is both wearable and showy without appearing heavy or overly dark. Durability is another selling point as corundum ranks nine on the Mohs hardness scale, making this gem far more resistant to daily wear than many popular colored stones such as amethyst or topaz, which means it is well suited for rings and other frequently worn settings. Because color change sapphires are comparatively rare relative to single tone sapphires, and because untreated material commands a premium in the market, this one point fifty five carat oval from Tanzania is attractive both as a wearable centerpiece and as a long term collectible. If you value natural provenance, eye clean clarity and the living drama of a gem that changes with its environment, this sapphire is an exceptional choice, and The Natural Sapphire Company can assist with additional imagery, fitting advice and certification options to support your purchase.