1.55 Ct. Cabochon Alexandrite from Tanzania

This listing presents one translucent alexandrite, weight 1.55 carat, oval shape, dimensions 7.35 x 5.33 x 3.90 mm, cut as a cabochon, clarity grade slightly included at eye level, intense color intensity, and an excellent polish. The stone is natural, with no enhancement, and it is sourced from Tanzania. The cabochon form emphasizes the gem body color and internal light transmission, producing a soft luminous field across the dome rather than facet driven scintillation. The moderate translucency allows light to penetrate and scatter internally, which works together with the cabochon profile to create a diffuse, evenly distributed glow. Slight inclusions visible at eye level are typical for natural alexandrite of this size and material, and they contribute to the gem character without impairing the overall visual impact. The excellent polish on the dome produces clean surface reflections, and the stone presents as well finished for immediate use in hand set jewelry.

Optically this alexandrite demonstrates classic color change, showing a cool green cast in fluorescent and daylight type lighting, and a warmer brownish to reddish cast under incandescent light, as seen in the provided images. The cabochon cut yields a silky, satiny sheen on the surface, with a narrower linear highlight that tracks across the dome as the gem is rotated. This type of surface reflection is distinctly different from faceted brilliance, it is broader and more diffuse, and it tends to emphasize the color transition rather than sparkle. The internal light scattering caused by translucency and the slightly included clarity gives the stone a gentle depth and inner glow, rather than mirror like reflectivity. Under directional light the band of highlight can appear relatively crisp because of the high quality polish, yet the overall reflective behavior remains subdued and elegant, favoring color play over facet flash.

When compared to other gemstones in the same category, this cabochon alexandrite exhibits reflective qualities that contrast with faceted alexandrite specimens, and with other chrysoberyl varieties. Faceted alexandrite will typically deliver higher apparent brightness and more defined facet reflections due to its ability to channel light and return it to the observer as brilliance. In contrast, a cabochon alexandrite such as this one emphasizes tonal shifts and an internal glow. Compared with cat eye chrysoberyl, which displays a distinct chatoyant band caused by parallel inclusions and tight fiber like structures, this cabochon does not present a pronounced cat eye effect, although the dome and polish create a narrow reflective strip on the surface. Compared with high dispersion gemstones such as moissanite, which reveal strong fire and colorful spectral flashes, alexandrite shows minimal fire and instead offers a true color change phenomenon driven by selective absorption. Compared with corundum color change sapphires, alexandrite often produces a more dramatic shift between green and red brown hues, whereas sapphire color change tends to remain within blue green or purple pink transitions and often benefits more from faceting for added brilliance. In terms of luster, alexandrite as a chrysoberyl mineral sits between vitreous and adamantine, and when cabochon cut it reads as a soft, waxy to silky sheen rather than the sharp mirror reflections of well polished faceted stones.

For practical wear and setting considerations, the cabochon shape and the stone translucency recommend settings that allow light to reach the dome, enabling the color change to be appreciated in multiple lighting conditions. Bezel settings that leave the crown exposed, low profile prong settings adapted for cabochons, and open back mounts that permit transmitted light will best display the internal glow and the green to brown transition. Routine care includes gentle cleaning with warm water and mild detergent, avoiding prolonged exposure to harsh chemicals and extreme heat, and storing separately to prevent surface abrasion to the polish. As an untreated, natural alexandrite from Tanzania, this gem represents a balance of rarity and practical wearability, suitable for collectors and jewelry designers who value authentic material and clear provenance. If you would like additional information or viewing options, The Natural Gemstone Company can provide detailed images and lighting views to assist in evaluation and setting decisions.