Queen Camilla’s Engagement Ring
About 5 carats, as reported emerald cut diamond by Not reliably reported. A royal heirloom that belonged to the Queen Mother
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Celebrity engagement rings / Grace Kelly
Grace Kelly’s engagement ring: what it is, and what it would cost you
PK
Parth KananiOctober 2026 · 4 min read
In short: Grace Kelly’s famous engagement ring is a 10.47 carat emerald-cut diamond with two baguette diamonds in platinum, by Cartier. Prince Rainier III of Monaco gave it to her in January 1956, replacing an earlier ruby and diamond band. It is still held by the Prince’s Palace of Monaco.
The ring
The facts, as reported
- Engaged
- January 1956
- Centre stone
- Emerald cut diamond
- Carat weight
- 10.47 carats, as given in Cartier and Prince’s Palace exhibition captions
- Setting
- Emerald-cut diamond with a baguette diamond on each side
- Metal
- Platinum
- Jeweller
- Cartier
- Reported value
- Not reliably reported
To scale
How big is it, really?
From above, it covers roughly 4.1× the area of a typical 1 carat round diamond. Drawn from the reported weight and typical proportions for the cut, so treat it as a close estimate.
The story
Why this ring gets talked about
Prince Rainier’s first ring for Grace Kelly was a Cartier eternity band of alternating rubies and diamonds. It was soon replaced by the emerald-cut diamond that became famous, and they married in April 1956.
She wore the ring on screen in her last film, High Society (1956). It has appeared in Cartier exhibitions on loan from the Prince’s Palace of Monaco, which still owns it.
What it means for you: this is the ring that made the emerald cut a classic. Emerald cuts show clarity more than any other shape, so a stone this size had to be exceptionally clean. At an everyday size, go for VS1 clarity or better.
Get the look
What a ring like this costs in Hatton Garden
An emerald-cut diamond with a baguette on each side, in platinum.
| Centre stone | Natural diamond | Lab-grown diamond |
|---|---|---|
| 1ct emerald | £4,000–£5,750 | £2,050–£3,400 |
| 1.5ct emerald | £6,950–£10,000 | £3,100–£5,350 |
| 2ct emerald | £11,200–£16,800 | £4,550–£8,400 |
Three-Stone in platinum, G colour, VS2 clarity, certified. Same pricing as our price checker.
More celebrity engagement rings
Or see every ring side by side.
Common Questions
How many carats is Grace Kelly’s engagement ring?+
10.47 carats, as given in Cartier and Prince’s Palace exhibition captions. The centre stone is an emerald cut diamond. Setting: Emerald-cut diamond with a baguette diamond on each side. Metal: Platinum.
Who made Grace Kelly’s engagement ring?+
Cartier.
How much would a ring like Grace Kelly’s cost in Hatton Garden?+
A 1 carat emerald three-stone in platinum costs about £4,000–£5,750 with a natural diamond, or £2,050–£3,400 lab-grown, in Hatton Garden.
Did Grace Kelly have two engagement rings?+
Yes. Prince Rainier first gave her a Cartier eternity band of rubies and diamonds, then the 10.47 carat emerald-cut diamond ring she became known for.
Sources
Carat weights and values are as reported by the press, not confirmed by the couple or the jeweller unless stated.