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Fine Jewellery, Trends & Advice

Explore our articles on trends, care tips and inspiration to help you find the perfect piece.

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What colour is sapphire?

Bonnot Paris · The Precious Stones Journal 2026 What colour is sapphire? None, in its pure state. What iron, titanium, chromium and vanadium create, the language of the trade, how to assess a hue — and where a sapphire ceases to be one. By François Deprez, founder · Guide […]

Bonnot ParisApril 29, 2026

Heated or Unheated Sapphire?

Bonnot Paris · The Precious Stone Journal 2026 Heated or Unheated Sapphire? What heat treatment really changes — colour, price, certificate —, the treatments to avoid, and how to make an informed choice, by our coloured-stone dealers. By François Deprez, founder · Complete Guide · 5 min […]

Bonnot ParisApril 29, 2026

Sapphire Price: Understanding the Value of This Exceptional Gemstone

Bonnot Paris · The Precious Stone Journal 2026 Sapphire Price: Understanding Its Value in 2026 How much does a sapphire really cost? The four criteria that determine its price, price ranges per carat, the real issue of heating — and the pitfalls we see every week at 10 rue de la Paix. […]

Bonnot ParisApril 29, 2026

A gemstone dealer in Angers for your precious stones

Bonnot Paris · The Precious Stones Journal 2026 A gemstone dealer in Angers What a dealer does that a retail jeweller does not, how an appointment unfolds, what you see there — and what is decided elsewhere. By François Deprez, founder · The House · 6 min · September 2026 Contents 01Dealer, […]

Bonnot ParisApril 29, 2026

What Is My Birthstone?

Bonnot Paris · The Precious Stones Journal 2026 What is your birthstone? The complete calendar of all twelve months — colours, symbolism and the origins of the tradition. Plus the question no one asks: which can be worn every day, and which cannot. By François Deprez, founder · Complete guide · […]

Bonnot ParisApril 29, 2026

Giving a Bespoke Ring for 20 Years of Marriage

Bonnot Paris · The Journal of Precious Stones 2026 A ring for twenty years of marriage Porcelain anniversary. No stone is prescribed by tradition — offering complete freedom. Four directions, the option of remounting the original ring, and what it costs. By François Deprez, founder · Anniversaries · 7 min · September 2026 […]

François DeprezApril 29, 2026

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