Buyer's guide

How to Choose an Engagement Ring — The Step-by-Step Guide

Forget the pressure. This is the decision tree that actually works — what to decide first, what can wait, and where your money makes the biggest difference.

Parth KananiSeptember 2026 · 10 min read

Choosing an engagement ring feels overwhelming because everyone gives you information in the wrong order. Jewellers talk about the 4Cs before you have even decided what shape you like. Friends tell you about carat weight before you know what metal suits her skin tone. The internet throws every option at you simultaneously.

Here is the order that actually works. We have talked to hundreds of buyers who have been through this process in Hatton Garden, and the people who felt confident about their purchase all followed roughly the same decision path. This guide walks you through it.

Step 1

Set your number first

Before you look at a single diamond, decide what you are comfortable spending. Not a vague range — an actual number. This is the most important decision you will make, because it filters everything else. Without a clear number, you will drift upward with every “but for just a bit more you could get...” conversation.

The old rule about spending two or three months' salary was invented by De Beers in the 1930s as a marketing campaign. It has no basis in tradition, culture, or common sense. Spend what feels right for your financial situation. A ring should start a marriage, not strain one. Our guide to how much to spend on an engagement ring shows what UK buyers really pay and how to pick your figure.

What your number gets you in Hatton Garden

You spend	Diamond	Metal	What to expect
£2,000	0.4 – 0.6 ct natural or 0.8 – 1.2 ct lab-grown	18K white gold	A well-cut diamond in a classic solitaire setting. Smaller than you see on Instagram, but genuinely beautiful on the hand
£3,000	0.6 – 0.9 ct natural or 1.2 – 1.8 ct lab-grown	18K white gold	The sweet spot for many buyers. Enough carat weight to feel substantial, good cut quality, and room for a halo
£5,000	0.9 – 1.2 ct natural or 1.8 – 2.5 ct lab-grown	18K gold or platinum	Serious options. Excellent cut, good colour and clarity, and platinum within reach. The ring that makes people look twice
£10,000+	1.5 – 2.0 ct natural or 3.5 ct+ lab-grown	Platinum	Premium territory. Excellent cut, high colour and clarity, statement size. At this level, every specification can be top-tier

Total ring prices for round diamonds, setting included, based on 2026 Hatton Garden pricing from online-first jewellers who publish their prices. Traditional showroom pricing may be higher for equivalent specifications due to different business models.

Not sure where you sit? Our Budget Reality Calculator shows you exactly what your number gets you in Hatton Garden — shape, carat, metal, and all.

Try the Budget Calculator

Step 2

Choose the diamond shape

Shape is the most personal decision in the entire process, and it is also the easiest to get right — because your partner almost certainly already has a preference. Check her Pinterest board. Look at what she saves on Instagram. Ask her best friend. If none of that works, round is the safest choice: it is the most popular shape, it suits every hand, and it has the most consistent sparkle.

Shape also affects your budget significantly. Round diamonds carry a premium of 20-30% over fancy shapes like oval, cushion, and emerald — because round cuts waste more rough stone during cutting. If you want maximum visual size for your investment, oval and pear shapes appear larger per carat than round.

Quick shape comparison

Shape	Relative price	Best for
Round	Highest	Maximum sparkle, classic look, suits every hand
Oval	20-30% less	Elongates fingers, appears larger per carat, trending
Cushion	25-35% less	Soft, romantic feel. Vintage-modern crossover
Emerald	30-40% less	Art deco, architectural, shows clarity over sparkle
Princess	20-30% less	Modern square look, strong sparkle, clean lines
Pear	25-35% less	Distinctive teardrop, appears very large on hand

Go deeper on shapes. Our full diamond shapes guide covers all ten shapes with visual comparisons, who each one suits, and current popularity trends.

Read the Diamond Shapes Guide

Step 3

Pick the metal

Metal choice comes down to three things: colour preference, durability, and whether she wears warm-toned or cool-toned jewellery already. Look at what she currently wears. If her watch, earrings, and necklaces are silver-toned, go white gold or platinum. If they are gold-toned, yellow gold. If she mixes both, rose gold works as a middle ground.

The metals compared

Metal	Colour	Durability	Notes
Platinum	Cool silver-white	Most durable	Naturally white, never needs re-plating. Heavier. 20-40% more expensive than gold
18ct white gold	Cool silver-white	Very good	Rhodium-plated for white finish. Needs re-plating every 1-3 years (£30-60). Most popular choice
18ct yellow gold	Warm gold	Very good	Classic, traditional. Makes slightly lower colour diamonds appear whiter by contrast
18ct rose gold	Warm pink	Very good	Trending strongly. Warm, distinctive, complements most skin tones. Copper alloy gives it strength

Our recommendation: If you are choosing between white gold and platinum, start with 18ct white gold. It looks identical to platinum when freshly plated, costs significantly less, and the maintenance (re-plating every couple of years) is minimal. If durability and zero maintenance matter most, go platinum — you pay more upfront but never worry about it.

Want the full breakdown? Our metal types guide covers how each metal ages, what maintenance looks like after one year, and the real cost difference.

Read the Metal Types Guide

Step 4

Get the ring size right

Getting this wrong is common and not a disaster — rings can be resized. But getting it right means the proposal moment is perfect without a trip back to the jeweller afterwards.

The three most reliable methods:

1. Borrow a ring she already wears

Take a ring from her jewellery box — one she wears on her ring finger (not index or middle, those are different sizes). Bring it to the jeweller or measure the inner diameter yourself. This is the most accurate method by far.

2. Ask her best friend or family

They might already know, or they can find out subtly. A close friend can take her ring shopping “just for fun” and note the size. More reliable than you might expect.

3. Use a printable ring sizer

Our Ring Size Finder tool gives you a printable guide that you can use with one of her existing rings. Place the ring on the printed circles to find the match. Accurate to within half a size.

If you genuinely cannot find out: the average UK women's ring size is L-M (US 6). If in doubt, go slightly larger rather than smaller — it is easier to size a ring down than up, and a ring that is slightly loose can still be worn immediately.

Need help? Our interactive Ring Size Finder walks you through each method step-by-step, with on-screen measurement tools.

Read the Ring Size Guide

Step 5

Choose the setting style

The setting is how the diamond is held in the ring. This affects how the ring looks, how the diamond catches light, and how practical the ring is for everyday wear. There are four main styles you need to know about.

Solitaire

One diamond, four or six prongs. The classic. Maximum light reaches the stone, making it appear as brilliant as possible. Timeless — it will never look dated. Best if you want the diamond to be the entire focus.

Halo

A ring of small diamonds surrounds the centre stone, making it appear 15-20% larger. Adds visual impact without a larger centre diamond. Popular with cushion and oval shapes. More detailed, slightly more vintage in feel.

Pavé

Small diamonds set into the band itself. Adds continuous sparkle around the finger. More delicate-looking and decorative. Consider that pavé bands are harder to resize and small stones can occasionally come loose with heavy daily wear.

Bezel

A metal rim fully surrounds the diamond edge. The most secure and low-profile setting — nothing catches on clothing. Slightly less sparkle because metal covers the edges, but extremely practical for active lifestyles. Modern, clean aesthetic.

Our recommendation: If this is your first time and you are not sure, start with a solitaire. It is the most versatile, the most timeless, and it lets you add a wedding band in any style later. You can always upgrade or change the setting in a few years once you both know what she prefers wearing every day.

Putting it all together

The decision tree that works

Follow this order and each decision narrows the next one naturally. Skip a step or start in the wrong place and everything feels overwhelming.

Set your budget

An actual number, not a range. This filters everything else.

Choose the shape

Based on her preference, not yours. Check her Pinterest or ask her friend.

Pick the metal

Match what she already wears. Warm jewellery = gold or rose gold. Cool = white gold or platinum.

Get the ring size

Borrow a ring, ask a friend, or use a sizer tool. Slightly large beats slightly small.

Choose the setting

Solitaire if unsure. Halo for more visual impact. Bezel for practical lifestyles.

Understand the 4Cs

Prioritise cut above everything. Then carat for size. Colour and clarity matter less than you think.

Compare jewellers

Get the same specs quoted by 2-3 different Hatton Garden jewellers. Compare like-for-like.

Perspective

What does not matter as much as you think

Once you have been reading about diamonds for a few hours, you start worrying about things that genuinely do not affect the experience of wearing the ring. Here is what you can stop stressing about.

Clarity below VS2

A VS2 diamond and a VVS1 diamond look identical to the naked eye on her hand. The difference only appears under 10x magnification in a lab. Unless she is going to examine her ring with a loupe every morning, the clarity grade above VS2 is paying for something invisible.

Colour above H

In a white gold or platinum setting, a G or H colour diamond looks colourless to the naked eye. The warmth only becomes noticeable around J-K grade. Paying the premium for D-E colour gives you bragging rights on the certificate but no visible difference on the hand. In yellow or rose gold settings, you can go even lower — the warm metal masks any slight colour.

Exact carat weight

A 0.95ct diamond looks identical to a 1.00ct diamond. But the price jumps significantly at whole and half-carat marks (0.50, 1.00, 1.50, 2.00). Buying just under these thresholds — 0.48ct or 0.90ct — gets you a visually identical stone for noticeably less. This is one of the few places where knowing the system gives you a genuine advantage.

Want the full 4Cs breakdown? Our guide explains exactly what each grade looks like in practice — not what a textbook says, but what you will actually see.

Read the 4Cs Guide

Final step

Where to go from here

You have done the hardest part — you know what you want. Now you need to find the right jeweller to make it. We recommend a specific approach.

Start online. Use a ring builder tool to configure your exact specifications — shape, carat range, colour, clarity, metal, setting — and see the price. This gives you a real baseline before talking to anyone. Online-first Hatton Garden jewellers like MOH London let you do this on their website with full pricing visible.

Then visit in person. Book appointments with two or three jewellers. Bring your specs. Ask each one to quote on the same diamond specifications so you are comparing like-for-like. See the stones in person — no screen replaces seeing a diamond with your own eyes under natural light.

Then decide. You will know who gave you the best experience, who was transparent about pricing, and who you trust. That feeling matters — you are going to come back to this jeweller for wedding bands, anniversaries, and future pieces.

Try the Ring Builder Read the Engagement Ring Guide

Common Questions

How much should I spend on an engagement ring?+

There is no rule. The old "three months salary" guideline was invented by a diamond company in the 1930s — it has no basis in anything real. Spend what feels right for your situation. In Hatton Garden, you can get a genuinely beautiful ring from around £2,000. At £5,000 you have serious options. Above £10,000 you are in premium territory. The right number is whatever lets you propose without financial stress.

Should I choose the ring myself or with my partner?+

That depends entirely on your relationship. About 60% of people now choose together — it removes the guessing and means she gets exactly what she wants. If you want the surprise element, do your homework: check her Pinterest, ask her best friend, or pay attention to what she says about other people's rings. Either approach works. The worst approach is guessing blindly.

What is the most important thing when choosing an engagement ring?+

Cut quality. Everything else — carat, colour, clarity — matters less than how well the diamond is cut. An Excellent cut diamond reflects light properly and looks brilliant on the hand. A poorly cut diamond, even a larger one, will look dull. If you need to compromise anywhere, compromise on clarity or colour before you compromise on cut.

Can I design a custom ring in Hatton Garden?+

Yes. Most Hatton Garden jewellers offer bespoke design services. Online-first jewellers like MOH London have ring builder tools where you configure your exact specs online. Traditional showroom jewellers will sketch a design with you in person. Bespoke typically takes 4-8 weeks from design to finished ring, so plan accordingly if you have a proposal date in mind.

What if she does not like the ring?+

Most reputable Hatton Garden jewellers offer exchanges or redesign services. Online purchases from UK businesses come with a 14-day cooling-off period by law. If you buy from a jeweller who offers a ring builder or bespoke service, you can often modify the setting, swap the stone, or change the metal within a set period. Ask about the returns and exchange policy before you buy — every shop is different.

Keep reading

Go deeper on each step of the process.

The 4Cs — What You'll Actually See

Forget the gemology lecture. Here's what affects how it looks on her hand — and what's just on paper

Read guide 8 min

Diamond Shapes Compared

Every shape side by side — how they look on a hand, who they suit, and what they cost per carat

Read guide 6 min

White Gold vs Platinum vs Rose Gold

Durability, colour over time, maintenance, and what actually looks different after a year of wearing it

Read guide 4 min

Finding Her Ring Size Secretly

Borrow a ring she already wears, use the string trick, or ask her best friend. Three methods that work

Read guide 3 min

Engagement Ring Buyer's Guide

The complete picture — styles, prices, where to buy, and what to ask before you commit

Read guide 8 min

What Things Actually Cost Here

Real price ranges by ring type, metal, and carat. No vague language — actual numbers

Read guide 5 min