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Buying Guides

How to Buy an Engagement Ring

A practical, no-nonsense walkthrough — budget, shape, cut, setting, metal, and sizing, from first browse to final build.

SAAT Gemology Team8 min read

Two ways to start

You can browse fully finished ring settings and pair one with a diamond, or start from a diamond you love and build a ring around it. Both paths end at the same place — a ring in the setting, metal, and stone you chose. The only difference is where you begin.

Start with the budget, not the diamond

Decide what you're comfortable spending before you look at any stones. The internet's "rules" (two months' salary, etc.) are marketing — not finance. The right budget is the one that lets you sleep well.

Once you have a number, allocate it: typically 60–70% for the diamond, 30–40% for the setting. Custom settings cost more than mass-produced ones. Buy-to-keep, not buy-to-flip.

Decide on the shape first

Shape is the most personal of all the choices and drives nearly everything else. Browse, save favourites, try shapes on at appointments. A round brilliant looks dramatically different from an oval or emerald — and there's no "better."

Once you've fallen in love with a shape, the rest of the choices narrow naturally.

Prioritise cut

Cut quality is the single biggest determinant of how a diamond actually looks. Never buy below Very Good. Aim for Excellent. Pay the premium for Ideal if budget allows on a round.

A poorly-cut F-VVS1 will look duller than an excellently-cut H-VS2. Cut is supreme.

Optimise colour and clarity for the setting

For platinum or white gold settings, prioritise F to H colour. For yellow gold, you can drop to I or J without visual loss.

For clarity, focus on eye-clean stones. Most VS2 and many SI1 diamonds are eye-clean and offer outstanding value. Don't pay for grades that are invisible to the naked eye.

Choosing a setting style

Setting style is the most personal decision in the process, and it shapes everything else:

  • Solitaire — a single diamond, minimal metal. Timeless, and the style that puts the diamond front and centre.
  • Halo — a ring of smaller diamonds surrounding the centre stone. Makes the centre diamond look larger and adds sparkle.
  • Pavé — small diamonds set along the band, adding continuous sparkle without competing with the centre stone.
  • Three stone — a centre diamond flanked by two smaller stones.
  • Vintage — intricate metalwork and detailing inspired by earlier eras.
  • Bezel — the diamond is fully wrapped in a metal rim, the most protective setting and popular for active lifestyles.
  • Cathedral — the band arches up to the centre stone for a raised, elegant profile.

Browse settings before you commit to a diamond shape — some styles suit round and oval stones better than fancy shapes like emerald or marquise.

Choosing a metal

See our full Metal Guide for detail, but as a quick rule: platinum and white gold suit cooler skin tones and higher-colour diamonds, while yellow and rose gold suit warmer tones and can flatter a touch of warmth in lower-colour stones.

Matching the diamond to the setting

A few pairings worth keeping in mind:

  • Prong count and style should suit the diamond shape — round and princess cuts need different prong configurations than pear or marquise.
  • Higher-colour diamonds (D–F) show best in platinum or white gold, where nothing competes with their whiteness.
  • A halo setting can let you size down the centre diamond while keeping a similar visual size — a useful budget lever.

Always insist on a certificate

GIA, IGI, or AGS — never EGL or HRD or no certificate. The certificate is your guarantee that the diamond is what the seller claims. Verify the certificate number on the lab's website before completing the purchase.

Use the buy-back as a safety net

Our buy-back guarantee at 50% within 3 years — on complete jewellery and loose stones from 1ct, natural or lab-grown — means you're never locked in. If your tastes change, your relationship changes, or your circumstances change — you have an exit. Buy with this in mind, not in fear of it.

Consider the long game

A fine diamond can last centuries. The setting can be replaced, redesigned, repurposed. The stone outlives all that. So spend most of your budget and care on the diamond itself — that's the part that endures.

Getting the size right

Ring size is the one measurement that's hardest to change once a stone is set. See our Ring Sizing Guide for how to measure at home. For a surprise proposal, borrowing a ring they already wear and tracing the inside is the most reliable method — and we offer free resizing within 6 months if an adjustment is needed afterward.

Building your ring, step by step

Our ring builder walks you through three steps:

  1. Setting — choose your style, metal, and band details
  2. Diamond — browse live inventory, filtered to complement your chosen setting
  3. Review — confirm your combination and see the full price breakdown before checkout

You can start from either end — setting first or diamond first — the builder keeps everything in sync either way.

A practical sequence

  1. Browse, save, narrow down to 2–3 shapes you love
  2. Set a budget
  3. Filter our catalogue by shape, cut Excellent or higher
  4. Within those, narrow by your colour and clarity preferences
  5. View the 360° media on your top 3–5 candidates
  6. Compare side-by-side
  7. Choose the one that resonates
  8. Pair with a setting

You will not regret patience. You may regret rushing.

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