1.35 Ct. Blue Sapphire from Tanzania

This heart shaped blue sapphire in our collection at The Natural Sapphire Company is a beautiful example of natural color and form, weighing 1.35 carat, with precise measurements of 6.61 by 7.25 by 3.65 mm. The mixed brilliant cut maximizes light return while preserving the romantic silhouette of a heart, and the excellent polish creates crisp facet lines and lively scintillation. Transparency is notable, with a clarity grade of slightly included when evaluated at eye level, which means that the stone reads clean to most observers while retaining natural inclusions that confirm its origin and authenticity. Color is the defining feature here, with a vivid color intensity that sits in a desirable range between deep cornflower and royal blue, and this stone is untreated, no enhancement, which is increasingly rare in today’s marketplace.

Compared to sapphires from Kashmir, this Tanzanian gem shows a different character, it lacks the classic velvety silk effect that Kashmir stones are famed for, yet it compensates with greater transparency and a more vivid, crystalline saturation that flashes from facet to facet. Against classic Ceylon sapphires from Sri Lanka, which often display a lighter, brighter, more pastel leaning blue, this Tanzanian heart offers a deeper and more concentrated tone, giving it presence and visual weight in a jewelry setting. When set beside Australian and Thai material that can trend toward a darker, inky blue or a greenish undertone, the Tanzanian stone reads purer and more vivid, while compared to Madagascar and Burmese stones that can deliver intense royal blues, this gem tends to present a slightly cooler and more focused hue, making it versatile for both contemporary and vintage inspired designs.

The mixed brilliant cut and the excellent polish of this heart shaped sapphire contribute to its superior face up appearance, and when compared with more traditional step cuts or cabochons from certain origins, the additional facets give this piece extra life. Slightly included clarity is actually an advantage for buyers seeking natural stones, because those small inclusions confirm that no clarity altering treatments have been applied. Many commercial sapphires on the market are heat treated to improve tone and remove inclusions, which can be appropriate, but untreated stones command a premium for their rarity and natural beauty. In practical terms, this sapphire will exhibit more sparkle in movement than darker, heavily included material, and its proportions allow the stone to sit comfortably in a ring, pendant, or bespoke piece that highlights the heart motif.

From a value and uniqueness perspective this Tanzanian heart sapphire stands out, because it combines a sought after weight and shape with vivid, untreated color and a cut that enhances brilliance. For buyers comparing stones from multiple locales, this gem offers a middle ground between the soft, sought after velvety blues of Kashmir, and the lighter, lively tones of Ceylon, while avoiding the overly dark or greenish tones sometimes found in Australian or lower grade material. At The Natural Sapphire Company we prioritize provenance and integrity, and an untreated Tanzanian sapphire of this quality is an investment in both beauty and rarity. For setting suggestions consider a simple solitaire to showcase the color and heart silhouette, or a delicate halo in white metal to enhance the vivid deep blue, or a yellow gold mount to warm the stone slightly and bring out any subtle royal undertones. Caring for this sapphire is straightforward, gentle cleaning with warm water, mild detergent, and a soft brush will maintain brilliance, and professional cleaning and inspection periodically will keep the mounting secure. If you would like further comparisons, setting ideas, or a viewing appointment, The Natural Sapphire Company is ready to assist with detailed images, measurements, and guidance to help you make the most informed choice.