Natural tanzanite, 9.08 carats, oval cut, flawless clarity, heated, bluish-purple

Natural Tanzanite 9.08 ct – Oval Cut, Heated

Name: Natural Tanzanite 9.08 ct – Oval Cut, Heated
Brand: SOSNA Gems & Jewellery
SKU: 2843667
Price: 172158.00 CZK
Availability: InStock

172.158,00 CZK

Gemstone Specification

Carat Weight 9.08

Dimensions 15.05 x 11.13 x 8.04 mm

Color Purplish Blue

Clarity Eye Clean

Shape Oval

Treatment Heated

Origin Tanzania

Certification GIA

This 8.96 carat natural tanzanite features a vivid purplish-blue color, enhanced by standard heat treatment, the accepted practice for this gem type. Measuring 13.40 x 11.90 x 8.60 mm, it is crafted into a cushion cut, a classic and highly desirable shape that emphasizes both brilliance and depth. Tanzanites of this size and clarity in cushion cut are considered excellent for collectors, while also offering potential as long-term investment assets. Its balanced proportions and rich color make it equally suited for an exclusive jewelry centerpiece or for preservation within a curated gemstone collection.

Natural Tanzanite 9.08 ct – Oval Cut, Heated

172.158,00 CZK

From gemstone to jewelry

This example illustrates one possible way a gemstone may be developed into a bespoke piece. Final design is always defined individually, based on the stone and its natural character.

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Gemological overview

Technical and gemological information about this gemstone variety.

Gemological profile

Tanzanite is a blue to violet-blue variety of the mineral zoisite, valued for its rich coloration and distinct pleochroism, which can display different hues depending on viewing angle and lighting conditions. In gem-quality material, tanzanite is appreciated for its depth of color and refined visual character, particularly in well-cut stones.
Chemically composed of calcium aluminum silicate (Ca₂Al₃(SiO₄)₃(OH)), tanzanite crystallizes in the orthorhombic crystal system and belongs to the silicate mineral group. Transparent gem-quality specimens typically display a vitreous luster with good clarity.
The refractive index of tanzanite generally ranges from approximately 1.69 to 1.70, contributing to a balanced brilliance rather than intense sparkle. Tanzanite is found exclusively in a single geographic area near Mount Kilimanjaro in Tanzania, a factor that contributes to its distinct identity among colored gemstones.

Durability & suitability

With a hardness of approximately 6 to 6.5 on the Mohs scale, tanzanite offers moderate durability suitable for jewelry when properly set and worn with care. While it can be used in a range of designs, it performs best in pieces that are less exposed to frequent impact, such as pendants, earrings, and protected ring settings.
Due to its moderate hardness and cleavage, thoughtful setting design is particularly important, especially for rings intended for regular wear. Tanzanite’s combination of color depth and elegance makes it especially well suited for refined, occasional-wear jewelry and expressive statement designs.

Treatments & authenticity

Tanzanite is commonly heat treated to enhance its blue and violet coloration, a practice that is standard within the gem trade and considered permanent and stable when properly disclosed. This treatment does not compromise the structural integrity of the gemstone.
Any treatments or enhancements are always clearly stated for each individual gemstone. Every stone is professionally examined, and transparent disclosure is regarded as a fundamental part of responsible gemological practice, allowing clients to make informed and confident decisions.

Our approach to gemstones

We focus primarily on natural, untreated gemstones, valued for their authenticity and inherent beauty.
Any treatments or enhancements are always clearly disclosed, allowing our clients to make informed decisions based on transparent gemological standards.

Sosna Gems is not a licensed financial advisor. Gemstones are collectibles, not securities. Past performance is not indicative of future results. Legal & risk disclosure .