Blue Sapphire: The Complete Guide (Meaning, Price & Origin)
Marie6/7/2026
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Given the abundance of offerings and sometimes complex artificial treatments, a legitimate question arises. As a creator of bespoke jewellery, Maison Bonnot Paris reveals the secrets of gemologists to help you identify the authenticity and quality of a gemstone.
First and foremost, an important point of vocabulary must be clarified. Historically, only four gemstones carry the designation "precious stone" — a status recognised by international gemology for centuries.
All other stones (aquamarine, tourmaline, garnet, etc.) were referred to as semi-precious or fine stones. Although French legislation today gathers all these marvels under the single term "gemstones", the quality criteria and evaluation methods remain specific to each stone.
The absolute benchmark in fine jewellery. Its unmatched hardness and singular fire make it the quintessential traditional engagement stone.
A symbol of fidelity and wisdom. Available in blue, pink, yellow or padparadscha — an endless palette for singular creations.
The ultimate expression of passionate red. Fine untreated rubies often surpass diamonds of equivalent carat weight in value.
Its velvety green and natural "garden" give it an unrivalled depth of character, beloved by Cleopatra and the great jewellery houses alike.
Without laboratory equipment, absolute certainty is impossible. Yet careful observation can reveal telling indicators. Here are three tests accessible to anyone wishing to assess a gemstone with the naked eye.
Immediate test
A genuine precious stone feels cool to the touch, even after prolonged contact with the skin. Glass or plastic quickly takes on the ambient temperature. A stone that remains cool is an encouraging first sign.
Under × 10 loupe
Nature is not perfect. Almost all natural stones contain inclusions. Under a jeweller's loupe (×10), a stone that appears "too perfect" is often a sign of synthesis or glass. The emerald makes its inclusions part of its very identity.
To assess the value and quality of a precious stone, experts rely on the internationally recognised 4C standard. These four criteria apply to every gemstone — from the diamond to the emerald.
The foremost criterion for coloured stones. Experts assess the hue, the tone (light to dark) and the saturation (intensity). Colour accounts for roughly 70% of the value of a ruby, a sapphire or an emerald.
The absence or presence of inclusions visible to the naked eye or under magnification. For a diamond, absolute purity is the ideal. For an emerald, inclusions are part of its very identity.
The way in which a stone has been faceted to reveal its fullest brilliance. A poor cut will render even a fine stone lifeless. An expert eye will recognise a quality cut at a glance.
The universal unit of measure: 1 carat = 0.20 grams. The heavier the stone, the rarer it becomes — and its value rises exponentially, not linearly, beyond certain thresholds.
Let us be clear: even the most practised eye can today be deceived by certain highly sophisticated synthetic stones. The only way to formally identify a precious stone is the gemmological certificate.
Issued by an independent, internationally recognised laboratory, this document is the identity card of your gemstone. It confirms that the stone is natural and specifies whether it has undergone any treatments — such as the classic heating of a sapphire or the oiling of an emerald.
The three most recognised laboratories in the world are the GIA (Gemological Institute of America), the GRS (GemResearch Swisslab) and the ALGT (Antwerp Laboratory for Gemstone Testing). At Bonnot Paris, all our precious stones are accompanied by a certificate from one of these independent bodies.
At Bonnot Paris, we have chosen absolute transparency. Because a bespoke jewel deserves an exceptional stone, we leave nothing to chance — from the mine to your finger.
At the source · Sri Lanka · India · Thailand
We are the only jewellery house to have our own buying offices directly in the producing countries, with no intermediary whatsoever.
Full traceability · Fair prices
By purchasing our gemstones directly at the source, we guarantee the traceability of your precious stone and the fairest price on the market.
Several indicators can guide you: the temperature to the touch (a genuine stone feels cold), the presence of natural inclusions visible under a loupe, and the way it interacts with light. That said, these observations are no substitute for a gemological certificate issued by an independent laboratory such as the GIA or the GRS.
The four historically recognised precious stones are the diamond, the sapphire, the ruby and the emerald. All other gemstones are grouped under the term "semi-precious stones" in France, even though their beauty and value can be equally remarkable.
The 4Cs are the four international criteria for evaluating a gemstone: Colour (hue, tone, saturation), Clarity (presence of inclusions), Cut (quality of the faceting) and Carat (weight, 1 carat = 0.20 grams). For coloured stones such as sapphire or ruby, colour accounts for approximately 70% of the value.
Bonnot Paris is one of the very few jewellery houses to operate its own buying offices directly at source, in Sri Lanka, India and Thailand. This direct sourcing eliminates intermediaries, ensuring full traceability and competitive pricing. Every stone we offer comes with an independent laboratory certificate. Book an appointment to explore our selection.
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Given the abundance of offerings and sometimes complex artificial treatments, a legitimate question arises. As a creator of bespoke jewellery, Maison Bonnot Paris reveals the secrets of gemologists to help you identify the authenticity and quality of a gemstone.
First and foremost, an important point of vocabulary must be clarified. Historically, only four gemstones carry the designation "precious stone" — a status recognised by international gemology for centuries.
All other stones (aquamarine, tourmaline, garnet, etc.) were referred to as semi-precious or fine stones. Although French legislation today gathers all these marvels under the single term "gemstones", the quality criteria and evaluation methods remain specific to each stone.
The absolute benchmark in fine jewellery. Its unmatched hardness and singular fire make it the quintessential traditional engagement stone.
A symbol of fidelity and wisdom. Available in blue, pink, yellow or padparadscha — an endless palette for singular creations.
The ultimate expression of passionate red. Fine untreated rubies often surpass diamonds of equivalent carat weight in value.
Its velvety green and natural "garden" give it an unrivalled depth of character, beloved by Cleopatra and the great jewellery houses alike.
Without laboratory equipment, absolute certainty is impossible. Yet careful observation can reveal telling indicators. Here are three tests accessible to anyone wishing to assess a gemstone with the naked eye.
Immediate test
A genuine precious stone feels cool to the touch, even after prolonged contact with the skin. Glass or plastic quickly takes on the ambient temperature. A stone that remains cool is an encouraging first sign.
Under × 10 loupe
Nature is not perfect. Almost all natural stones contain inclusions. Under a jeweller's loupe (×10), a stone that appears "too perfect" is often a sign of synthesis or glass. The emerald makes its inclusions part of its very identity.
To assess the value and quality of a precious stone, experts rely on the internationally recognised 4C standard. These four criteria apply to every gemstone — from the diamond to the emerald.
The foremost criterion for coloured stones. Experts assess the hue, the tone (light to dark) and the saturation (intensity). Colour accounts for roughly 70% of the value of a ruby, a sapphire or an emerald.
The absence or presence of inclusions visible to the naked eye or under magnification. For a diamond, absolute purity is the ideal. For an emerald, inclusions are part of its very identity.
The way in which a stone has been faceted to reveal its fullest brilliance. A poor cut will render even a fine stone lifeless. An expert eye will recognise a quality cut at a glance.
The universal unit of measure: 1 carat = 0.20 grams. The heavier the stone, the rarer it becomes — and its value rises exponentially, not linearly, beyond certain thresholds.
Let us be clear: even the most practised eye can today be deceived by certain highly sophisticated synthetic stones. The only way to formally identify a precious stone is the gemmological certificate.
Issued by an independent, internationally recognised laboratory, this document is the identity card of your gemstone. It confirms that the stone is natural and specifies whether it has undergone any treatments — such as the classic heating of a sapphire or the oiling of an emerald.
The three most recognised laboratories in the world are the GIA (Gemological Institute of America), the GRS (GemResearch Swisslab) and the ALGT (Antwerp Laboratory for Gemstone Testing). At Bonnot Paris, all our precious stones are accompanied by a certificate from one of these independent bodies.
At Bonnot Paris, we have chosen absolute transparency. Because a bespoke jewel deserves an exceptional stone, we leave nothing to chance — from the mine to your finger.
At the source · Sri Lanka · India · Thailand
We are the only jewellery house to have our own buying offices directly in the producing countries, with no intermediary whatsoever.
Full traceability · Fair prices
By purchasing our gemstones directly at the source, we guarantee the traceability of your precious stone and the fairest price on the market.
Several indicators can guide you: the temperature to the touch (a genuine stone feels cold), the presence of natural inclusions visible under a loupe, and the way it interacts with light. That said, these observations are no substitute for a gemological certificate issued by an independent laboratory such as the GIA or the GRS.
The four historically recognised precious stones are the diamond, the sapphire, the ruby and the emerald. All other gemstones are grouped under the term "semi-precious stones" in France, even though their beauty and value can be equally remarkable.
The 4Cs are the four international criteria for evaluating a gemstone: Colour (hue, tone, saturation), Clarity (presence of inclusions), Cut (quality of the faceting) and Carat (weight, 1 carat = 0.20 grams). For coloured stones such as sapphire or ruby, colour accounts for approximately 70% of the value.
Bonnot Paris is one of the very few jewellery houses to operate its own buying offices directly at source, in Sri Lanka, India and Thailand. This direct sourcing eliminates intermediaries, ensuring full traceability and competitive pricing. Every stone we offer comes with an independent laboratory certificate. Book an appointment to explore our selection.
Partagez ce post
Découvrez d'autres articles qui peuvent vous intéresser pour approfondir votre passion pour la joaillerie !
View all