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Harlow Mercantile
EducationGuide · 7 min read

A guide to custom fine jewelry.

How to think about commissioning a piece around a loose stone — from a short brief to CAD, wax, casting, setting, and the final finish.

Why start with a loose stone

The best custom pieces begin with the stone, not the setting. A great diamond or gemstone has its own proportions, colour, and character, and the setting exists to hold it and show it well. Choosing the stone first means the design is built around something real, not drawn in the abstract.

It also lets you spend the budget in the right order: stone quality first, then the metal, then the detail work.

Start with a short brief, not a Pinterest board

Three or four sentences about how the piece should feel are more useful to a jeweller than fifty saved images. Modern or classical. Delicate or substantial. High-set or low-profile. Everyday or occasion. Yellow gold, white gold, platinum, rose. That's usually enough to start.

Images help once the direction is set, especially for showing proportion (a delicate band vs. a chunky one) rather than exact silhouettes to copy.

CAD, wax, and getting the proportions right

Most custom pieces today start in CAD. You'll see rendered images and often a 3D-printed wax or resin model before anything is cast. Handle the model. Try it on. Check that the band width, gallery height, and prong position feel right in real life, because this is the cheapest moment to change them.

Small proportion changes — a millimetre on a band, a degree on a basket — are the difference between a piece that reads elegant and one that reads bulky.

Casting, setting, and finish

Once the model is signed off, the piece is cast in your chosen metal, cleaned up, and set. Setting is the most delicate step: prongs are shaped around the stone, bezels are pressed in, pavé is bead-set one seat at a time. This is where a good bench jeweller earns their keep.

Finish is the last quiet decision. High polish reads glossy and formal. Matte or brushed reads modern and softer. Hammered reads hand-made. All three can look beautiful on the same silhouette.

Timeline and budget, honestly

A custom piece typically takes four to eight weeks once the design is approved. Rushing it usually shows in the finish. Build in a buffer if the piece is for a specific date.

Custom work costs more in labour than a comparable ready-made piece, but almost always less than the same design from a name-brand house. Most of the difference goes into bench time, not markup, and you get something that fits the wearer exactly.

How Harlow helps

We don't run our own bench, but every stone in the Vault ships loose with its full IGI report and dimensions — everything a jeweller needs to start a design. If you've chosen a stone and want a hand finding a bench jeweller you can trust, send us a note and we'll point you in the right direction.

Still deciding

Talk it through with a real person.

Send us a note and we'll reply within one business day.

Contact us
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