Engagement Ring Guide 2026: Diamonds, Shapes, Metals and Prices

The right engagement ring starts with a budget you are comfortable with, then a diamond chosen on cut first, colour and clarity second and carat weight last, set in a metal and setting that suit daily wear. At Coveti, the Boodles engagement edit runs to 133 rings from $5,150 to $4,107,280, all in our engagement rings category, so you can compare shapes, metals and prices side by side before you choose.

Key facts

• The 4Cs are cut, colour, clarity and carat; carat measures weight, not size, and one carat equals 0.2 grams.
• Boodles says its diamonds are typically selected within the D to G colour range, the whitest end of the D to Z scale.
• Boodles diamonds are generally certified over three quarters of a carat, and Boodles engraves the carat weight inside the shank of its diamond rings.
• The Ashoka is a 62 facet cut that Boodles says it is the only British jeweller to offer.
• Boodles sizes its rings on the UK letter scale, typically within I to P, including half sizes.
• Some Boodles engagement rings are made to order, and the product page then asks you to allow up to 12 weeks for delivery.
• Coveti ships new, authenticated pieces with insured worldwide delivery by DHL Express and FedEx.

How much should you spend on an engagement ring in 2026?

Spend the figure you can pay without strain, then work backwards. The old rule of a set number of months’ salary was an advertising line, never a gemmological one, and it says nothing about the ring that suits the wearer.

It helps to see where real prices sit. Across the 133 Boodles engagement rings on Coveti, 20 are under $10,000, 64 sit between $10,000 and $30,000, and 24 are above $100,000, where the rarest stones and high jewellery designs live.

Where the money goes

Carat weight drives price faster than any other factor, because larger rough diamonds are rarer. The jump is steepest at the round numbers: a 1 carat stone costs noticeably more than a 0.9 carat stone of the same quality, even though the eye can barely tell them apart on the hand.

You can see the effect inside one design. The Boodles Brilliance Yellow Gold Diamond Engagement Ring 0.25 Carat is $5,150, while the Classic Platinum Diamond Engagement Ring 1 Carat FVS1 is $26,430.

A simple way to set the budget

1. Fix the total you are happy to spend, including any import duty in your country.
2. Decide the shape the wearer loves, since shape changes price per carat.
3. Choose the metal and setting, which settle the rest of the ring’s cost.
4. Spend what is left on the best cut you can find, then balance colour, clarity and weight.

What are the 4Cs of a diamond?

The 4Cs are the shared language of diamond grading. Boodles adds three of its own, certification, creativity and confidence, and its diamond guide calls quality of cut paramount, because perfect proportions mean more sparkle.

Cut

Cut is the quality of the facets and proportions, not the shape. A well cut diamond returns light to the eye; a poorly cut one leaks it out of the base and looks glassy. If you trade down on one C, never let it be cut.

Colour

White diamonds are graded from D, colourless, to Z, light yellow. Boodles says its diamonds are typically selected within the D to G range. In yellow gold, a slightly warmer stone can look whiter than it would in platinum, which is one place a budget can stretch.

Clarity

Clarity describes natural inclusions. The scale runs from Flawless through VVS1 and VVS2 (very, very slightly included), VS1 and VS2 (very slightly included), down to SI and I grades. A VS stone usually looks clean to the naked eye. On Coveti, a Boodles ring name such as 0.7 Carat GVS2 reads as the carat weight, then the colour grade G, then the clarity grade VS2.

Carat

Carat is weight. Boodles puts it plainly: a better quality of diamond is always best, whatever the weight. Two stones of the same carat can also look different in size, depending on how deep the cutter left them.

Which diamond shape should you choose?

Shape is personal, but each one behaves differently on the hand. The table below sets out how the main shapes look, what they suit and where to see them in the Boodles edit.

Round brilliant

The round brilliant is the safe and brilliant choice, the shape cutters have refined for the most sparkle. The Vintage Round Platinum Diamond Engagement Ring 0.7 Carat FVS2 at $11,310 adds 0.33 carats of further diamonds around the centre stone.

Oval, pear and marquise

These elongated shapes all make the finger look longer and the stone look larger for its weight. Pear and marquise points are the vulnerable part of the stone, so check that a claw guards each tip. The Petal Pear Cut Platinum Diamond Engagement Ring is $22,320; the Petal Marquise in yellow gold is $43,040.

Cushion, emerald and Asscher

Step cuts such as the emerald and Asscher show flashes of light across broad facets rather than a scatter of sparkle, and they show inclusions more clearly, so clarity matters more here. The Trilogy Asscher Diamond Rose Gold Ring, $85,050, carries 3.02 carats of Asscher diamonds in Single Mine Origin gold, traceable to one mine.

The Ashoka cut

The Ashoka is cut by the William Goldberg family in New York. Boodles says it makes a diamond appear 30 percent larger than an emerald cut of the same carat weight, that it can take up to six months to cut and polish, and that fewer than one percent of rough diamonds can achieve the shape. Coveti lists 16 Ashoka engagement rings, including The Boodles Ashoka Diamond Platinum Engagement Ring at $28,670.

Platinum vs 18 carat gold: which metal is better?

Neither is better in the abstract; they wear differently. Of the Boodles engagement rings on Coveti, 84 are in platinum, 37 in yellow gold and 12 in rose gold.

Platinum

Platinum is naturally white, dense and heavy on the hand. It does not wear away when scratched; the metal moves across the surface and settles into a soft patina, which many people like. It is the classic choice for white diamonds, because it never casts warmth into the stone.

18 carat gold

18 carat gold is 75 percent pure gold, alloyed for strength. Yellow gold flatters warm skin and slightly warmer diamonds, and rose gold sits well with pink stones. Gold is lighter than platinum and, over many years, very slowly wears thinner, so have the claws checked. Boodles states that it uses Single Mine Origin gold in all its jewellery.

Matching the wedding band

Choose the band in the same metal as the engagement ring, since two different metals worn together can rub. Coveti’s diamond wedding bands start at $4,960, and our eternity rings run from $5,710.

Solitaire, halo, three stone and toi et moi: which setting suits you?

Boodles says that how a stone is mounted can dramatically alter its appearance, and that multi-stone rings are its speciality.

Solitaire

One diamond on a plain band. It puts every dollar into the centre stone and sits neatly beside any wedding band. The Boodles Brilliance and Classic designs are the house’s solitaires.

Halo

A ring of small diamonds around the centre stone makes it look larger and adds sparkle at a lower cost per carat. The Vintage Round Platinum Pink Halo Diamond Ring, $9,440, frames a 0.50 carat brilliant cut diamond.

Three stone

Boodles calls this the Trilogy. The Trilogy Round Brilliant Platinum Diamond Engagement Ring, $36,510, has a certificated 1.00 carat centre diamond and 1.25 carats of side diamonds. Side stones add width and presence without the price of one larger diamond.

Toi et moi

Two stones set side by side, one for each partner. It is the most personal of the four and suits mixed shapes, such as a pear beside an oval. Our explainer what is a toi et moi ring covers the history and how to wear one.

How do UK ring sizes work?

The UK uses letters, from A up to Z, with half sizes in between; the US uses numbers. As an approximate guide, UK J and a half is about a US 5, UK L and a half about a US 6, UK N and a half about a US 7, and UK P and a half about a US 8.

Boodles sizes its rings on the British letter scale and makes most designs within UK I to P, including half sizes. The exact range is listed on each product page. A ring set all the way round with stones cannot be resized later, so check the Coveti size guide first.

How to find the size without asking

1. Borrow a ring the wearer already wears on the same finger.
2. Have a jeweller measure it on a ring stick, then note the letter.
3. Fingers swell in heat and at the end of the day, so measure in the afternoon.
4. If the knuckle is wide, the ring must pass over it; choose the larger half size.

Does an engagement ring diamond need a certificate?

For a centre stone of any real size, a grading report is the independent record of its 4Cs. Boodles says its diamonds are generally certified over three quarters of a carat, and its guide adds that the certificate should be only one small part of your choice, since no report explains why you love one ring more than another.

On Coveti, look for the word certificated in the product description. The Florentine Pear Diamond Platinum Ring, $17,280, has a certificated 0.70 carat pear diamond with 0.03 carats of pink diamonds. Boodles also says all its diamonds come from legitimate sources not involved in funding conflict, in compliance with United Nations resolutions.

How long does a made to order engagement ring take?

Some Boodles engagement rings are made to order, mainly the larger graded solitaires in the Boodles Brilliance, Classic and Vintage Round lines. On those pages the description asks you to allow up to 12 weeks for delivery. If you have a proposal date, work back from it and leave a margin for size checks and shipping.

How do you buy a Boodles engagement ring at Coveti?

1. Browse the engagement rings category and filter to Boodles.
2. Read the description for carat weight, any certificated stone and the size range.
3. Check for a made to order note and its lead time.
4. Choose the UK size from the size guide.
5. Check out; the ring ships with insured DHL Express and FedEx delivery, mostly Delivered Duty Unpaid, so local duty and taxes are paid on arrival.

Every piece Coveti sells is new and authenticated. If you are still comparing houses, the Cartier, Messika and David Yurman hubs sit beside Boodles, and our guide to British fine jewellery houses puts Boodles in context.

Which Boodles engagement rings should you look at first?

Boodles traces its business back to 1798 and is now a sixth-generation, family-owned British jeweller; our profile who is Boodles tells the full story. For engagement rings, these are the lines to know.

• Boodles Brilliance: the round solitaire, from $5,150 for 0.25 carats.
• Classic: a clean solitaire in graded weights from 0.4 carats, from $5,330.
• Vintage: rounds, ovals and pears with diamond detail, from $6,830.
• Petal: a softer claw setting in oval, pear, heart, marquise and Ashoka, from $20,450.
• Trilogy: three stone rings in round, Ashoka, Asscher and sapphire, from $15,970.
• Harmony: round, oval, cushion, pear, princess and Ashoka, from $7,010.

If a coloured centre stone appeals, read emerald vs sapphire vs ruby rings, and for the rarest diamonds of all, our pink diamonds guide. The wider diamond rings edit holds 377 Boodles pieces.

Frequently asked questions

How much does a Boodles engagement ring cost?

Boodles engagement rings at Coveti range from $5,150 for a 0.25 carat Boodles Brilliance solitaire to $4,107,280 for an Ashoka split shoulder diamond ring.

Which of the 4Cs matters most?

Cut matters most, because it decides how much light a diamond returns, and Boodles itself calls quality of cut paramount.

Is platinum better than gold for an engagement ring?

Platinum is naturally white and develops a patina without losing metal, while 18 carat gold is lighter and warmer, so the better metal is the one that suits the wearer and matches the wedding band.

What ring sizes does Boodles make?

Boodles sizes its rings on the UK letter scale and makes most designs within UK I to P, including half sizes, with the exact range shown on each product page.

Can a Boodles engagement ring be resized?

A ring set all the way round with stones cannot be resized later, so check the Coveti size guide before you order.

Do Boodles diamonds come with a certificate?

Boodles says its diamonds are generally certified over three quarters of a carat, and Coveti product descriptions state when a stone is certificated.

How long does a made to order Boodles ring take?

Where a Boodles engagement ring is made to order, the product page asks you to allow up to 12 weeks for delivery.

What is an Ashoka diamond?

The Ashoka is a 62 facet diamond cut by the William Goldberg family in New York, which Boodles says it is the only British jeweller to offer.

Shop Boodles at Coveti

From a first solitaire to a three stone Ashoka, the full Boodles at Coveti edit brings engagement rings, wedding bands and eternity rings together in one place, new and authenticated, with insured worldwide delivery by DHL Express and FedEx.