How to Design Custom Jewellery, Starting With the Engagement Ring

The Port of Jewels custom form asks for exactly three things: product type, metal, and an optional photo. That's it. The hard part was never the form. It's knowing what to put in it.

Most people start a custom order with a vague picture in their head and a lot of unanswered questions. What shape looks best? Should it be lab-grown or natural? Does 18k gold actually matter? This guide walks through those choices in order, from the setting down to the small details that change how a ring feels on the hand. Whether you're in the US, UK, Germany, Australia, Monaco or Malta, the process works the same way, and by the end you'll have a clear brief ready to send.

What does custom jewellery actually mean?

Custom doesn't mean starting from a blank page every time. There are three real routes into it.

The first is picking from ready-made designs and adjusting small things, like metal colour or band width. The second is combining an existing setting with a diamond you choose separately. The third is fully custom, built from a sketch or a photo of something you love.

That third route sounds intimidating, but it isn't. A saved photo from Instagram or a screenshot of a ring you liked online is a real starting brief. The Port of Jewels custom form has a photo upload field for exactly this reason. You don't need technical language. You need a picture and a rough idea of what you'd change about it.

Custom also doesn't automatically mean expensive. It means you're choosing the diamond, the metal and the details yourself, rather than accepting whatever combination a display case happens to have in stock.

Where should you start, the stone or the setting?

Here's a simple rule. Start with the setting if you already know her style. Start with the stone if you know the shape she'd want but nothing else.

A solitaire engagement ring keeps all the attention on one diamond, sitting alone on a plain band. It's the classic choice, and it wears well for decades because there's nothing to date it. A halo engagement ring surrounds the centre stone with smaller diamonds, which makes the whole ring look bigger without paying for a larger carat weight. A hidden halo ring does the same trick underneath the stone instead of around it, so from the front it reads as a clean solitaire, but it catches extra sparkle from certain angles.

Three stone engagement rings use a centre diamond flanked by two smaller ones, often read as past, present and future. Pavé and  channel set rings line the band with tiny diamonds for continuous sparkle, while a  bezel setting wraps a thin rim of metal fully around the stone, which protects it well for anyone with an active daily routine. Side stone settings sit between a solitaire and a halo, adding just a touch of extra shine along the band.

If you're buying this as a surprise and can't ask outright, check what she already wears. Someone who wears delicate stacked rings usually leans toward a solitaire or hidden halo. Someone who wears bold, statement jewellery tends to like a halo or pavé band.

Which diamond shape looks best for your budget?

Shape changes how big a diamond looks and where your money goes. For a deeper look at every cut, read our guide to diamond shapes and sparkle.

Round diamonds are the most traditional and the most expensive per carat, because cutting a round stone wastes more of the rough diamond. Oval and pear shapes are elongated, so they tend to look larger than a round diamond of the same carat weight, and that size illusion is one of the easiest ways to get more visual impact for the same budget. If you're weighing up size, our carat size comparison guide shows how each weight looks on the hand.

Emerald and Asscher cuts are step-cut, meaning the facets run in straight lines instead of triangles. That style shows off clarity more than a round or cushion cut does, so if you're set on one of these two shapes, it's worth paying closer attention to the clarity grade rather than cutting corners there.

Cushion cuts sit in the middle: a softened square shape with rounded corners that reads as both classic and slightly romantic, depending on how the facets are cut.

Lab-grown or natural, and what should the certificate say?

Port of Jewels sells both lab-grown and natural diamonds. Chemically and visually, they're the same stone. The real difference is origin and price, with lab-grown diamonds typically costing noticeably less for the same size and quality. Our lab-grown vs natural diamonds buyer's guide covers the trade-offs in full.

Whichever you choose, ask for an independent grading report from GIA or IGI, and check that the report number printed on the paperwork matches the number laser-inscribed on the diamond's girdle. You can verify any GIA report on GIA Report Check, and IGI reports on the IGI website. This is the step people skip most often, and it's the one that protects you if you ever need to insure, resize or resell the ring.

One practical tip on clarity: SI2 or better is usually eye clean, meaning no inclusions are visible without magnification. Paying extra for a flawless or internally flawless grade often buys invisible perfection that nobody, including you, will ever actually see. (GIA's clarity scale explainer shows all 11 grades.)

Which metal is right for a ring you'll wear every day?

Yellow gold has a warm tone and shows scratches less than white metals, since it doesn't rely on a surface coating. White gold is plated with rhodium for its bright finish, which means it needs replating every year or two as that coating wears down. Rose gold sits in between, with a pink-toned alloy that's grown popular for its softer look against skin.

Platinum is the most durable option and naturally hypoallergenic, but it's also the heaviest and the most expensive of the group. Gold, by comparison, is usually sold in 14k or 18k purity. 14k gold is mixed with more alloy metal, which makes it harder and better suited to daily wear. 18k gold has a richer, deeper colour but scratches more easily over time.

If you already have a wedding band in mind, match the metal now rather than later. Mixing white gold and platinum, for instance, is fine stylistically, but matching metals side by side ages more evenly.

What small details change how the ring feels day to day?

The details nobody asks about are often the ones you notice most once you're wearing the ring.

Band width affects comfort more than most people expect. A wider band feels more secure but can feel bulky on smaller hands, while a thin band is more delicate but shows wear faster. Prong count matters for security: four prongs show off more of the diamond, six prongs hold it more securely, which matters if you're active with your hands.

Setting height is worth thinking through too. A low setting sits close to the finger and snags less on clothing and hair, while a taller setting lets more light into the diamond from underneath but catches on things more easily. Engraving inside the band, whether it's a date or initials, adds a personal touch that costs little and shows to no one but you.

It's worth designing the engagement ring and wedding band together rather than as two separate purchases. A ring that looks perfect alone can sit awkwardly next to a wedding band bought months later without matching it in mind. And if you're planning the proposal as a full moment, a pair of  matching diamond stud earrings makes a natural gift to go alongside the ring on the wedding day itself.

How does the custom process work at Port of Jewels?

The process starts with the custom jewellery form, where you choose the product type and metal and can upload a reference photo. From there, you can book a 30-minute virtual appointment to talk through the diamond, the setting and the finer details with someone directly. Every piece is made in our own workshop, and you can read more about who we are on our story page.

A note on the next steps: this guide doesn't cover exact turnaround times, whether a sketch or 3D preview is shared before production, resizing policy, or shipping and duties by country, since none of that is confirmed yet. Once you have those answers, this section is the place to add them, since international buyers in Monaco, Malta and elsewhere will want that detail before they commit.

Before your appointment, it helps to have a few things ready: a rough budget range, her ring size if you know it (the ring size guide helps here), a reference photo, and a preferred diamond shape. Walking in with those four things turns a vague conversation into a short, focused one.

Questions people ask before they order

How long does a custom engagement ring take to make?

It depends on how complex the design is. You'll get a timeline for your specific ring during your virtual appointment, before anything goes into production.

What if I don't know her ring size?

Check the Port of Jewels size guide, or borrow a ring she already wears on that finger and bring it, or a photo of it, to your appointment.

Can the ring be resized later?

Resizing is common with most fine jewellery, though it depends on the setting (full pavé and channel bands are harder to resize). Ask about your specific design during the appointment, and see our returns and refund policy for details.

Are lab-grown diamonds real diamonds?

Yes. Lab-grown and natural diamonds are chemically and visually the same. Lab-grown stones usually cost noticeably less for the same size and quality. Read the full lab-grown vs natural comparison.

Which diamond shape looks biggest for the money?

Oval and pear diamonds usually look larger than a round diamond of the same carat weight, because their elongated shape spreads the stone's surface area.

Is 14k or 18k gold better for an engagement ring?

For everyday wear, 14k gold is harder and more scratch-resistant. 18k gold has a richer colour but scratches more easily over time.

Where to go from here

Start with the setting or the stone, pick a shape that fits your budget, ask for a real certificate, choose a metal built for how you live, and don't skip the small details. That's the whole path from idea to finished ring.

The easiest next step is sending a photo through the custom jewellery form, or booking the free 30-minute virtual appointment to talk it through directly. Want ideas first? Browse our full ring collection.