Engagement Ring Guide
for Beginners

Before anything else: two questions

Everything else in this guide is secondary to these two:

What kind of ring would she actually wear? Not what you think looks good. What does she wear day-to-day, classic and simple, or more decorative? Does she prefer gold or silver-toned jewellery? Does she work with her hands? If you are not sure, our practical buying advice guide has a section specifically on how to find out without asking her directly. Getting this wrong is a worse mistake than overpaying.

What can you genuinely afford? Set a real number before you walk into anywhere. Jewellers are good at expanding budgets. Know yours. Our budget quiz shows exactly what your number gets you at different quality levels.

The 4Cs, the only diamond knowledge you actually need

Every diamond is graded on four things: Cut, Colour, Clarity, and Carat. Jewellers call them the 4Cs. Here is what they mean and what to do with each one.

Cut, the only one that really matters

Cut is about how well the diamond is made, not what shape it is. A well-cut diamond bounces light around inside and throws it back at you, that is the sparkle. A badly cut one looks dull and glassy, no matter how big or expensive the stone.

When you see a grading certificate, look for Excellent or Very Good cut. Never trade down on cut to save money. It is the difference between a ring that looks alive and one that looks flat.

Colour, G or H, and stop there

Diamonds run from D (completely colourless) to Z (visibly yellow-tinted). The difference between D and H is invisible to a normal person looking at a ring in normal light. You pay a big premium for D, E, and F because the certificate says so, not because anyone can see it.

Buy G or H. In a yellow gold setting you can go to I or J and it looks great. Do not spend extra on D, E, or F unless you want to.

Clarity, go eye-clean and stop

Clarity measures flaws inside the stone (called inclusions). Most are invisible without a magnifying loupe. You want what is called eye-clean: no flaws visible when you look at it normally.

VS2 or SI1 on the scale hits this perfectly. Flawless diamonds have no inclusions even under a microscope, but you are paying for that certificate, not anything you or anyone else will ever see on her finger.

Carat, size, but not the only way to get it

Carat is weight (one carat = 0.2 grams). Bigger diamonds cost more per carat as well as in total. A 1.0ct stone costs dramatically more than two 0.5ct stones of the same quality, simply because large diamonds are rare.

Important: a well-cut smaller stone can look bigger than a poorly-cut larger one, because the angles push light outward. This is another reason cut comes first.

Use our diamond size visual guide to see how stones actually look at different carat weights, it is much more useful than reading numbers.

Want the full breakdown? Read our complete 4Cs guide.

Shape, what she sees first

Shape is different from cut. Shape is the outline: round, oval, cushion, pear, emerald, and so on. Cut is how well that shape is made.

Round is the most popular by a long way. It sparkles the most. It also costs the most, because more raw diamond is wasted in cutting it.

Oval is hugely popular right now. It looks bigger for the same carat weight, costs less than round, and looks great on most hand shapes. A smart choice if budget matters.

Cushion (a rounded square) is softer and more vintage-feeling. Emerald and Asscher have a completely different look, more like a mirror than a sparkler, architectural and understated. They tend to attract women with a particular, deliberate taste.

Pear and marquise are elongated shapes that make the finger look longer. More of a statement.

See them all drawn to scale in our interactive shape guide. Drag between sizes. Much easier than imagining it.

Settings, how the stone is held

The setting is the metalwork. It changes the whole look of the ring as much as the stone does.

Solitaire: one stone, clean metal, nothing else. The most classic. Works with any stone shape. Never goes out of style. If she is elegant and unfussy, this is almost certainly right.

Halo: a ring of smaller diamonds around the centre stone. Makes the ring look much bigger. More decorative. Can look dated faster than a plain solitaire.

Three-stone: a centre stone with one on each side. Traditionally past, present, future. Looks considered without being over the top.

Pavé band: small diamonds set into the band itself for extra sparkle on the sides. Usually combined with a solitaire centre.

Bezel: the stone is enclosed in a rim of metal instead of prongs. Very secure and clean-looking. Good if she is hands-on.

Full breakdown with photos: how to choose a setting. Not sure what style she would go for? Try the ring style finder quiz.

Metal, keep it simple

Platinum is the best. Naturally white, does not need replating, ages well, lasts forever. Also the most expensive.

18ct white gold looks similar to platinum but has a rhodium coating that wears off over a few years and needs redoing. Cheaper than platinum.

18ct yellow gold is warm, classic, and very fashionable right now. Suits a lower colour diamond and costs less than platinum.

18ct rose gold is pink-toned. Beautiful on certain skin tones. Popular with a particular type of buyer.

Do not buy 9ct gold for an engagement ring. Too low-grade.

Natural vs lab-grown, the honest version

Lab-grown diamonds are chemically identical to mined ones. Same hardness, same sparkle, same everything. They cost 60–80% less. That is not a typo.

The one real difference: lab-grown diamonds do not hold their resale value the way natural ones do. The market for them second-hand is currently limited.

If your budget is a real constraint and she cares more about size and quality than the geological origin of the stone, lab-grown is a completely legitimate choice. If the rarity and story of a natural diamond matter to either of you, go natural. Neither is wrong.

The size guide shows side-by-side what each budget buys in natural vs lab-grown. The gap is significant. Worth a look before you decide.

Budget, what to actually spend

The "two months' salary" rule is a marketing line invented by De Beers in the 1980s. Ignore it. Spend what you can genuinely afford without financial stress.

In London, £2,000 to £5,000 is a genuine starting point for quality work. You can buy a well-cut, eye-clean diamond solitaire in a proper setting at that level, particularly through the independents in Hatton Garden, Chelsea, and Richmond. The big Bond Street houses start properly at £10,000 and up.

Use the budget quiz to see what your number actually gets you. Then read the full budget guide if you want the detail.

Bespoke or ready-made?

Ready-made means you choose from what the jeweller already has. You can take it away quickly, often the same week. It is not second best, some of the finest rings in London are ready-made.

Bespoke means designed from scratch for her. Takes four to eight weeks typically and costs more. But it is entirely personal and can be exactly what she would want.

If you find something off the shelf that is right, buy it. If you have a clear vision of something specific that does not exist yet, commission it. Our bespoke vs ready-made guide walks through the decision properly.

Where to buy in London

The address of the jeweller does not determine the quality of the ring. A great independent in Hatton Garden will out-make a famous name on Bond Street in many cases, at a fraction of the cost. Here is how the areas break down.

Hatton Garden is London's jewellery quarter. High density of dealers and workshops. Best value in the city. Read the Hatton Garden buying guide before you go, there are things worth knowing.

Mayfair and Bond Street is where the grand houses are: Cartier, Graff, Boodles, Pragnell. Exceptional service, exceptional price. Right if the name matters and budget allows.

Chelsea, Knightsbridge, Richmond, Notting Hill all have excellent independents. More personal than Hatton Garden, less formal than Bond Street. Our location guides cover each one.

At the appointment

A good jeweller asks questions. They want to know about her, her style, her lifestyle, your budget. They show you options and let you look properly. They do not rush you.

Ask to see the same carat weight in different cut qualities. The difference in sparkle will be immediately obvious. Ask to see the grading certificate for any stone you are seriously considering. If a jeweller gets evasive or pushy, walk out. There are plenty more.

Go in knowing your budget and do not budge much. Our consultation questions guide gives you a full list of what to ask.

Ring size

Most rings can be resized after the fact, so getting it slightly wrong is not a disaster. If unsure, go slightly bigger, easier to take down than up.

The best way to find the size without asking her: borrow a ring she already wears on her ring finger and take it to the jeweller. If that is not possible, wrap a thin strip of paper around the base of her ring finger while she sleeps, mark where it overlaps, and measure it. UK average for women is around size M. Use the proposal timeline tool to plan when to get sizing sorted relative to your proposal date.

How long does it take?

Ready-made: same day to a few days. Resizing adds a week or two. Bespoke: four to eight weeks typically, sometimes more for complex designs. If you have a date in mind, plan backwards from it and add a buffer. Build your full timeline with the proposal planner.