Engagement ring buying guide
An engagement ring involves more decisions than most people expect. Stone, setting, metal, style, size, budget — each one shapes what you end up with. This guide walks through each choice so you know what you're looking at before you start.
Setting a budget
The idea that you should spend two or three months' salary is a marketing invention from the 1980s. There is no correct amount. Engagement rings exist at virtually every price point — what matters is finding the right ring within a number you're comfortable with.
It helps to set a budget before you start looking. It shapes every subsequent decision: the size of stone that's realistic, the metal, the setting. Going in without one makes the process harder, not more open-minded.
The centre stone
Most engagement rings feature a diamond, though coloured gemstones have grown significantly in popularity — sapphires, rubies, and emeralds in particular.
Diamonds
Diamonds (and lab diamonds) are graded on four characteristics: cut, colour, clarity, and carat weight — the four Cs. Cut determines how the diamond handles light and affects its brilliance. Colour is graded from D (colourless) to Z (yellow tint); where a stone sits on that scale is a matter of personal preference and budget. Clarity refers to internal inclusions — many are invisible to the naked eye and have no effect on how the stone looks in everyday wear. Carat is a measure of weight, not size, though the two are related.
Coloured gemstones
Sapphires are the most popular alternative to diamonds, typically in deep cornflower blue, though they are also available in pink, yellow, and white. Key quality factors are colour intensity and evenness, and the absence of visible inclusions. Rubies offer deep red warmth — the best examples have a vivid, even colour without brown or orange tones. Emeralds are a rich green but softer than diamonds and sapphires, which means the setting needs to offer more protection to the stone.
Unlike diamonds, coloured gemstones have no universal grading standard, so quality assessment relies more on the expertise of the jeweller you buy from.
Ring settings
The setting holds the stone and defines the character of the ring as much as the stone itself. A solitaire — a single stone in a simple mount — is the most popular choice, letting the stone do all the work. A halo surrounds the centre stone with smaller diamonds, creating the appearance of a larger stone overall. Three-stone rings add two flanking stones and tend to feel more ornate. Pavé bands feature small diamonds set closely along the band. A bezel setting encircles the stone in metal rather than prongs — a cleaner, more modern look that also offers more protection for softer stones.
The setting you choose should suit both the stone and how the ring will be worn day to day.
Some rings are made to order rather than taken from existing stock. A bespoke commission lets you specify the stone, setting, metal, and any personal details from scratch. Lead times are typically four to eight weeks.
Choosing a metal
The main choice is between platinum and gold — and within gold, white, yellow, or rose. Platinum is naturally white, the most durable option, and hypoallergenic, but the most expensive. White gold is rhodium-plated to appear bright white and is a popular alternative at a slightly lower price, though it requires replating every few years as the coating wears. Yellow and rose gold are warmer in tone — rose gold gets its colour from a copper alloy and has grown significantly in popularity.
For a significant piece, 18ct is the standard — it contains 75% pure gold and has a rich colour. 9ct gold is more affordable and harder wearing but lighter in tone. The right metal depends on the stone, the setting style, and how the wearer lives.
Ring size
Resizing is possible but not always straightforward — particularly for rings with stones set around the band — so getting it right first time matters.
The most reliable method is to borrow a ring the person already wears on their ring finger and have it measured. Paper strip guides are available online but are less accurate. If you're buying without knowing the size, erring slightly larger is safer — sizing down is generally easier than sizing up, and a one-size adjustment is usually straightforward.
Certification and hallmarking
Any significant diamond should come with a certificate from an independent grading laboratory. GIA (Gemological Institute of America) and IGI (International Gemological Institute) are the most widely recognised. The certificate records the stone's cut, colour, clarity, and carat weight — an objective reference for what you've bought. Certificates issued by the selling jeweller rather than an independent body carry less weight.
UK hallmarking is a legal requirement for gold, silver, and platinum articles sold in the UK above a minimum weight. The hallmark is struck by one of the four UK assay offices — London, Birmingham, Edinburgh, or Sheffield — and certifies the metal's purity. A ring sold without one should raise questions.
Look for:
- —The fineness mark (e.g. 750 for 18ct gold, 950 for platinum)
- —The assay office mark
- —The date letter (optional since 1999, but often present)
