Tanzanite · 6.8ct

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Attributs de la pierre

Origine de la pierre

Valeur & critères de qualité

Traitements & améliorations

Tanzanite Features

Discovered in the 1960s, this precious stone is exclusively extracted from the Merelani hills, located near Mount Kilimanjaro in Tanzania, from which it gets its name.

Minéral

Variety of zoisite

Composition

Ca2(Al.OH)Al2(SiO4)3

Couleur

Purple to Blue

Indice de réfraction

1.691 - 1.700

Biréfringence

0.008 to 0.013

Densité

3.35

Dureté de Mohs

6.0 - 7.0

Origin of Tanzanite

Geographical sources and historical origins

Tanzania

TheTanzaniteis a mysterious gem, with a unique blue-violet color that sets it apart from other gemstones. Its origins in a single location, the foothills of Mount Kilimanjaro in Tanzania, and its availability make ita stone  sought after by jewelers.

The value and quality of a Tanzanite

How to determine the value of a Tanzanite?

The value of tanzanite is primarily based on the intensity of its blue-violet color, its clarity, its size, and the quality of its cut. The most sought-after stones display deep hues, few inclusions, and a meticulous cut that enhances their brilliance. Tanzanite prices can range from a few hundred dollars per carat for smaller, lower-quality stones to several thousand dollars per carat for larger, high-quality stones.

Nevertheless, it is important to note that the market currently offers a large number of stones with high carat weights and remarkable clarity. In a context of abundance, it is logical tobe more reserved regarding their purely speculative potential (investment).
On the other hand, this availability paves the way for exceptional jewelry creations: tanzanite makes it possible to design bold, elegant, and highly original pieces.

Treatment and enhancement of Tanzanite

What are these treatments?

The blue to violet hue of tanzanite is one of its most sought-after features. Rough tanzanite is generally a brownish color, and finding a naturally blue specimen remains exceptional. This is why the majority of tanzanites obtain their characteristic color thanks to aheat treatment, consisting of heating the stone between500 and 600 °Cfor about onehalf an hour. That only a handful of laboratories in the world are capable of detecting the origin of heat treatment.

Our Sourcing of Precious Stones

At Bonnot Paris, we are committed to providing the best precious stones through rigorous and ethical sourcing.

We've developed three main sourcing methods to ensure the quality and traceability of our gems: directly from mines, through brokers, and from renowned cutting centers. Discover our methods in detail below.

LEVEL 1

Directly at the mine

We favor direct partnerships with mines, which allows us to obtain rough gemstones directly from the source.

Our partnerships span the globe, including Africa (Namibia, Mozambique, Tanzania, Kenya), Vietnam, and Sri Lanka. We carefully select gemstones based on their quality and then have them cut by our workshops in France and Bangkok, ensuring complete control over the transformation process.

LEVEL 2

From local Brokers

Our collaborations with international brokers allow us to acquire precious stones over a wide geographical area.

These brokers, based in Africa, Brazil, Colombia, and Vietnam, travel across vast territories to source gemstones that meet our strict criteria of quality, traceability, and price. The purchased rough stones are then cut in our specialized workshops in France and Bangkok.

LEVEL 3

From the main pruning centers

We have strategically located offices in Jaipur, Bangkok and Beruwala (Sri Lanka).

These centers allow us to purchase pre-cut gemstones, such as Zambian emeralds in Jaipur or sapphires and other various gemstones in Sri Lanka and Bangkok. Thanks to these offices, we can precisely meet the specific demands of our customers by offering a wide range of high-quality stones.

More competitive prices

These three levels of sourcing allow us to offer you the best precious stones at the best price, while guaranteeing their origin and exceptional quality.

We are committed to maintaining these standards to continue to satisfy our most demanding customers.

LEVEL 4 - NOT APPLIED AT BONNOT PARIS

From Merchants Resellers

The vast majority of traditional jewelers use dealers in their country to buy their stones.

This results in a limited choice of products and, above all, prices that are far removed from market prices.

LEVEL 5 - NOT APPLIED AT BONNOT PARIS

At the jeweler

Once again, the majority of jewelers tend to favor the sale of their own stones to the detriment of customer desires.

By offering only a limited selection, the jeweler inevitably influences the choice. At Bonnot Paris, it's the customer who chooses, and we source the ideal stone for their needs.

Certification and Ethics: OurCommitments

Certification and ethics are essential pillars of Maison Bonnot Paris. Each stone we offer is certified by renowned independent laboratories, such as GIA, AIGS, ICA, LFG, and SSEF.

This guarantees the authenticity and quality of our gems. In addition, we pride ourselves on knowing the origin of the majority of the stones we offer.

Many come from brokers located in extraction areas we know well, ensuring impeccable traceability and ethics.

Although ethics is at the heart of our commitment, we recognize that much remains to be done in this area.

We are committed to continuing our efforts to ensure responsible and ethical sourcing of every stone.

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Certification by partner laboratories

At Bonnot Paris, each precious stone goes through our certification laboratory.

Through rigorous testing and state-of-the-art equipment, we guarantee the authenticity, purity, and quality of our gemstones. Each stone is accompanied by a certificate of authenticity issued by our experts, ensuring our clients complete transparency and absolute confidence in their investment.

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Expertise in French Jewelry

At Bonnot Paris, we are proud to perpetuate the tradition of French jewelry craftsmanship.

Each piece is designed and crafted in our workshop in France, where expertise and innovation combine to create unique and timeless jewelry. We carefully select the rarest gemstones to offer our customers exceptional quality.

Rare and Exclusive Gems

Bonnot Paris stands out for its rigorous selection of precious and rare gems.

Our experts travel the world to discover stones with unique colors and radiances. Each gem is chosen for its beauty, rarity, and value, guaranteeing exceptional jewelry that will enhance every moment of your life.

Custom Jewelry

Make your dreams come true with Bonnot Paris.

We offer a bespoke jewelry design service, where every detail is carefully considered to match your desires. From design to completion, we guide you every step of the way to create a piece that tells your story and reflects your personality.

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Follow us on Instagram to discover our latest creations, behind-the-scenes looks at our workshop, and exclusive glimpses of our unique gemstones.

Stay connected with Bonnot Paris and be inspired by our innovative designs and exceptional craftsmanship. Join our community and share your passion for exceptional jewelry.

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Testimonials

"My experience at Bonnot Paris was incredible from start to finish. From the first meeting, I knew I was in good hands.
François took the time to understand my needs and preferences, and presented me with a selection of stones that were each more beautiful than the last. The design process was truly collaborative. The designer drew 5 options and was very receptive to my feedback. The end result is a custom-made ring that I love."
Christelle

"We called on Mr. Deprez to create our wedding rings. From the first meeting, he understood my husband's style. The designs are very well done, and the entire team is very attentive to any changes that may be necessary. Mr. Deprez was also able to adapt perfectly to the budget he was given.
The rings are of impeccable quality. We will definitely use them again for other projects!"
Oceane

“I am absolutely delighted with the experience I had with Bonnot Joaillerie creating a custom engagement ring for my fiancée.
The process was smooth and enjoyable, and the staff was incredibly professional, attentive, and patient. François was truly able to guide me through the selection of stones (size, quality, etc.). Their expertise and attention to detail exceeded all my expectations.
The ring is simply magnificent, perfectly reflecting my fiancée's tastes and personality!"
Tidiane

"Bonnot Paris jewelry is exceptional. The stones are dazzlingly beautiful. François sets out straight away to conquer exceptional gems!
Why go to a "famous" jewelry house when François and his team will guide you throughout the process of creating a unique piece of jewelry, perfectly suited to your tastes and personality?
Eugenie