Sapphire Engagement Ring: The Bonnot Guide — Budget, Colours & Setting
bastien1/8/2026
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Pure sapphire — crystallised aluminium oxide — reflects no colour at all. Iron and titanium give it blue and teal. Chromium gives it pink and, combined with orange colour centres, padparadscha. Vanadium and certain iron-chromium combinations give it violet.
There is only one clear boundary: when chromium becomes concentrated enough to tip the stone into red, it changes name and becomes a ruby. Same mineral, same hardness of 9 out of 10, sometimes the same deposit — but an entirely different market.
This spectrum brings together the sapphire colours currently in our showcases: each band represents a real stone. The five families that follow describe each one in detail.
From the deep royal blue to the velvety cornflower of Ceylon, blue remains the most requested colour. Its intensity stems from the very mechanism that produces it: an interplay between an iron atom and a titanium atom, particularly effective at absorbing light.
The market has named its preferences. Royal blue denotes intense, deep blues; cornflower, a lighter and velvety blue; Ceylon blue, the luminous softness characteristic of Sri Lanka. A greyish or overly dark blue, on the other hand, loses a considerable part of its value.
View blue sapphire engagement rings →
A luminous, almost weightless cornflower blue. The oval cut elongates the finger and lets the colour breathe freely.
€17,160
A tempered Ceylon blue, with no harshness to it. The cushion cut softens the light and gentles the shade still further.
€5,400
Electric blue in its purest form: direct, free of any grey, it commands attention before the setting even enters the picture.
€8,808
A well-balanced royal blue, neither too light nor too deep. The natural choice for an engagement ring.
€5,568
The radiant cut multiplies the facets and sets a deep blue alive with brilliance. A resolutely contemporary sparkle.
€9,552
A blue that drifts towards green, on the border of teal. For those who find royal blue a little too expected.
€1,992
Prices recorded in August 2026; each stone is unique.
The price per carat of a blue sapphire does not rise in a straight line with weight: it accelerates. A three-carat stone costs considerably more than three times the price of a comparable one-carat stone. View all blue sapphires →
Teal is not a colour so much as a spectrum. Iron alone pushes the stone towards green; iron and titanium together draw it towards blue. Depending on the natural balance of the two, the same name can cover a forest green, a deep teal blue or a lagoon-like shade.
Collectors seek the mermaid equilibrium, where blue and green hold equal weight; and no two of these stones could ever be reproduced identically. Almost all come from Madagascar, many are unheated, and this is the most accessible family in the collection.
View teal sapphire engagement rings →
A light, almost turquoise teal. Three carats of lagoon water — the most luminous stone in the family.
6 396 €
Decidedly green, with just enough blue to keep things interesting. A woodland teal rather than an oceanic one.
2 112 €
A balanced blue-green and unheated: the stone exactly as it left the earth, entirely untouched.
744 €
The ideal balance between blue and green, in a size that sits beautifully as a solitaire.
1 200 €
A deep sea-green with hints of pine. A shade you will scarcely find outside Madagascar.
948 €
The blue side of teal, saturated and crisp. One shade further and we would simply call it a blue sapphire.
1 248 €
Prices noted in August 2026; each stone is unique.
Matching teal sapphires to one another is one of the most delicate exercises in fine jewellery: two stones sharing the same name can differ enormously. It is a skill that makes all the difference on a pavé ring.
The padparadscha is not judged by intensity but by balance: neither the pink nor the orange should dominate. Its name comes from the Sinhalese padmaraga, the lotus flower, and it is the only sapphire to carry a proper name.
It is also the only one whose appellation is controlled. An independent laboratory — SSEF, GRS, AGL, Lotus, GIA — must recognise the hue in writing; without that confirmation, the stone remains a pink or orange sapphire. Two laboratories may, moreover, reach different conclusions on the very same gem.
View padparadscha sapphire engagement rings →
Soft pink veiled with apricot, in a pear cut that draws out the light. Ceylon, the historic source.
2 448 €
Luminous coral, saturated without being garish. A decidedly sunny padparadscha, magnificent in rose gold.
6 420 €
Powdery pink with a hint of mauve, remarkably gentle in character. Ceylon, in a very classic cushion cut.
11 712 €
Under a carat, an accessible padparadscha that retains what matters most: the balance between pink and orange.
1 368 €
Four and a half carats: the standout piece of this selection, and the rarest shade in the spectrum.
238,800 €
A deep padparadscha, almost garnet. A darker, more sophisticated reading of the lotus blossom.
4,584 €
Prices noted in August 2026; each stone is one of a kind.
With this colour more than any other, the certificate sets the price. A compelling pink-orange with no laboratory mention of "padparadscha" remains a pink sapphire, and is valued accordingly. It is the first document to request — here or anywhere. View padparadscha sapphires →
The pink of a sapphire comes from chromium — the very same element that gives ruby its red. Only the concentration differs: the higher it rises, the further the colour slides toward red, until the point at which the stone changes its name.
Sri Lanka supplies the most luminous shades; Madagascar — the Ilakaka region — the most saturated pinks. This selection also includes a stone from Vietnam and one from Mozambique, two origins that remain rare on the French market.
View pink sapphire engagement rings →
A soft, luminous pink in a round cut. The quintessential romantic pink, at a very accessible carat weight.
912 €
A clear raspberry pink, bright and cheerful. Two carats that carry the colour without ever overwhelming it.
5,208 €
A very gentle, almost mauve powdery pink. An old-rose tone that ages remarkably well.
3,204 €
Eight carats of fuchsia pink. A collector's stone, in the most classic cushion cut there is.
120 120 €
A dense and rare hot pink, from Mozambique. The rectangle cut underscores its purity.
13 344 €
The most saturated of all pinks: an almost violet magenta, concentrated in a small pear.
1 140 €
Prices observed in August 2026; each stone is unique.
At comparable quality, a pink sapphire remains well below the price of a ruby. It is the most elegant alternative for those who love red without the budget — or the inclination.
From an almost transparent lavender to a deep purple, violet occupies a pivotal position: some stones lean towards blue, others come close to crossing the border into pink.
This instability is what gives it its reputation. Some violet sapphires are known as color change: they shift to blue in daylight and to violet under incandescent light. The phenomenon, sought after by collectors, commands a premium. This family is often confused with amethyst — yet 9 on the Mohs scale against 7 is a very different proposition.
View violet sapphire engagement rings →
Very pale lavender, almost bluish. The softest shade in the family, luminous in white gold.
1 188 €
A muted, greyish violet, on the edge of mauve. Elegant rather than striking.
2,532 €
Amethyst in appearance, sapphire in reality: a pure, frank violet, with all the hardness that implies.
1,656 €
A distinctly blue-leaning violet, deep and dense. A twilight hue, rare at such saturation.
2,808 €
A frank purple-violet in a rectangle cut. Graphic, modern, and remarkably photogenic.
1,596 €
The most intense of the violets: a dense, almost magenta purple. All the character of the family in one stone.
1,848 €
Prices noted in August 2026; each stone is unique.
Violet sapphire is rarer than blue, yet considerably more accessible: demand remains niche. It is currently one of the finest bargains in the colour spectrum. View violet sapphires →
Once the hue is chosen, the metal accounts for half the result. It can echo the stone's tone or play against it — both approaches work, but they suit different sensibilities.
| Metal | What it does to the colour | Ideal for |
|---|---|---|
| Yellow gold | Warms the stone and lends a vintage character to the setting. | Deep blues, teal |
| White gold | A crisp contrast that draws out the gemstone's saturation. | Teal, violet |
| Platinum | A cool, bright white — the densest and most durable of metals. | Royal blue, teal |
| Rose gold | Extends and softens warm tones. | Pink, padparadscha |
The colour swatches on this page are indicative: a sapphire reads differently depending on the angle and the light, and no screen is calibrated the same way. We routinely send videos of shortlisted stones, and you are welcome to view them in person at 10 rue de la Paix.
Every colour except red. A sapphire is colourless in its pure state; its colour comes from trace elements present within the stone. Iron and titanium produce blue and teal, chromium gives pink and padparadscha, vanadium yields violet. When chromium becomes concentrated enough to tip the stone into red, it changes name and becomes a ruby.
The padparadscha. It is the only sapphire to carry a proper name, and the only one whose designation is strictly controlled: an independent laboratory must confirm the pink-orange balance, failing which the stone remains a pink or orange sapphire.
Chromium concentration, and nothing else. The higher it rises, the further the colour shifts toward red, until the point at which the stone changes designation. That threshold is debated between laboratories: the GIA places it earlier than the SSEF. In practice, a pink sapphire remains considerably more accessible than a ruby of comparable quality.
A teal sapphire blends blue and green into a single, homogeneous hue. A bi-colour sapphire, by contrast, displays two visibly distinct colour zones within the same stone. Two opposing aesthetics from the same mineral family.
Heating is a traditional and widely accepted treatment that enhances colour; the vast majority of sapphires on the market are heated. An unheated sapphire is rarer, and its certificate will state as much: this is a collector's criterion, not a requirement. We do, however, exclude any treatment involving beryllium, lead glass or irradiation.
Yes. We provide detailed photographs and videos of each selected stone, and then offer support by WhatsApp or email through to the delivery of the finished piece. Book a video appointment →
There is no wrong answer, only different temperaments. Blue remains the timeless reference, teal the great contemporary choice, padparadscha the collector's selection. The true criterion lies elsewhere: choose the stone you will want to look at every day. View sapphire engagement rings →
This sapphire colour palette covers five of the ten families. Yellow, orange, peach, green and bi-colour will be explored in a second instalment; in the meantime, everything can be browsed from the sapphire page.
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