1.01 Ct. Bluish Green Sapphire from Tanzania

This sapphire is a refined example of natural corundum offered by The Natural Sapphire Company, a transparent oval that weighs 1.01 carat and measures 6.64 x 5.60 x 3.47 mm. The shape is classic oval with a mixed brilliant cut that combines a faceted pavilion designed for light return with a brilliant style crown that enhances scintillation. The color is bluish green with intense saturation, and the stone has been graded eye clean when viewed at normal viewing distance without magnification, which means that there are no inclusions visible to the naked eye. The polish is excellent, which allows facets to meet crisply and for light to pass and reflect without diffusion. Importantly this sapphire is reported as no enhancement, representing an unheated natural stone, a factor that matters to discerning buyers because the lack of heat treatment is rarer and often commands a premium. The origin is Tanzania, which is known for producing a wide range of attractive corundum hues, and provenance from a reputable source forms part of the investment grade story that educated buyers value when assessing natural gemstones.

From a gemological perspective this stone exhibits the attributes that trained buyers and gemologists use to assess quality. The mixed brilliant cut proportions, including the measurements and depth of 3.47 mm, produce an attractive length to width ratio of about 1.19 which is pleasing in jewelry design and maximizes face up color. Corundum has a refractive index in the range of about 1.762 to 1.770, and a specific gravity around 4.00, properties that contribute to the stone feeling weighty for size and having strong optical performance. Bluish green coloration in sapphire can display pleochroism, meaning that under different viewing angles the stone may show variations between blue and green tones, which adds visual complexity and desirability. The eye clean clarity grading indicates that inclusions are minute or internal features are situated in positions that do not affect transparency or durability, which improves the stone value compared to similar colored sapphires with visible inclusions. The excellent polish and faceting precision further increase appeal to buyers looking for gems that will perform well in finished jewelry and maintain their visual quality over time.

Durability is an important consideration for everyday wear and for preservation of value, and sapphire scores nine on the Mohs scale of mineral hardness. This places sapphire just below diamond which scores ten, and above gemstones such as topaz which scores eight and quartz which scores seven, indicating that sapphire is highly resistant to scratching in normal wear. Corundum also has no true cleavage, which reduces the risk of splitting under impact compared with minerals that have perfect cleavage. For practical use in rings and bracelets settings with protective features are still advisable, and choices such as a bezel setting offer maximum protection for the girdle and pavilion, while a secure four or six prong setting will expose more of the crown for light performance while maintaining stability. For collectors and connoisseurs the combination of an unheated Tanzanian origin, eye clean clarity, intense bluish green color, and a well executed mixed brilliant cut make this 1.01 carat oval an attractive and durable choice that performs both as a wearable heirloom and as an investment grade gem. If you seek further technical details, recommendations for mounting, or certified documentation from The Natural Sapphire Company, our team is ready to assist with additional measurements and gemological reports.