Blog

Fine Jewellery, Trends & Advice

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

Emerald Anniversary: 40 Years of Marriage

Bonnot Paris · The Precious Stones Journal 2026 Emerald Anniversary Forty years of marriage, and a stone that speaks of renewal rather than permanence. What it represents, which ring to give, and the one constraint it imposes. By François Deprez, founder · Anniversaries · 8 min · September 2026 Contents 01Forty years, the emerald 02The […]

François DeprezSeptember 15, 2026

Sapphire Colours: The Complete Colour Chart

Bonnot Paris · The Precious Stone Journal 2026 Sapphire Colours Every colour except red. Nine families, thirty-six shades observed in our real stones, the price per carat for each—and the boundary beyond which it is no longer a sapphire. By François Deprez, founder · Colour chart · 11 min · September […]

François DeprezAugust 5, 2026

bague de fiançailles saphir bleu bonnot paris

Blue Sapphire: Complete Guide (Meaning, Price and Origin)

Bonnot Paris · The Precious Stone Journal 2026 Blue sapphire What creates this blue, what the words used to describe it are worth, where the stones come from, what they cost slice by slice — and why “darker, more expensive” is wrong. By François Deprez, founder · Stone guide · 10 […]

François DeprezJuly 6, 2026

Teal Sapphire: Colour, Origins and Price per Carat | Bonnot Paris

Bonnot Paris · The Precious Stone Journal 2026 The teal sapphire What iron and titanium do to colour, six real stones from green to blue, their origins, and prices per carat recorded from our own stock. By François Deprez, founder · Stone guide · 8 min · September 2026 […]

François DeprezJuly 6, 2026

The Ruby Guide: origins, quality, prices and expert advice

Bonnot Paris · The Precious Stone Journal 2026 The ruby guide The rarest of the four major gemstones above two carats, and the most treated on the market. Its origins, quality criteria, prices — and what to check before buying. By François Deprez, founder · Gemstone guide · 9 […]

François DeprezJune 15, 2026

Sapphire or diamond for your ring?

Bonnot Paris · The Journal of Precious Stones 2026 Sapphire or diamond? Hardness, price, size for the same budget, true rarity and lab-grown diamonds. A dealer’s comparison — and why the question is often poorly framed. By François Deprez, founder · Comparison · 8 min · September 2026 Contents 01A poorly framed question […]

François DeprezApril 29, 2026

2/9