How Fine Jewelry Is Really Made: The Casting Process
Feb 19, 2026
The DIVETIA Making Series: You're reading Part 1. Continue with Part 2: From Raw Silver to Finished Charm and Part 3: The Craftsmen Behind DIVETIA.
Most people have no idea how a piece of jewelry actually gets made. And honestly, that's fair — from the outside, it looks like magic. A sketch becomes a design becomes a polished silver charm with a stone set at its heart. How exactly that happens is rarely shown.
We want to show it.
This is Part 1 of a three-part series going behind the scenes of how every DIVETIA charm and pendant is made — from the very first pour of molten silver to the moment the finished piece passes final inspection. It's a process that blends modern precision with old-school craft, and we think it's worth understanding.
Let's start at the beginning: investment casting.
The Foundation: Where Digital Design Meets Traditional Craft
Every DIVETIA piece starts as a digital file. Our designers work in CAD — computer-aided design software — mapping every curve, edge, and surface of each charm to fractions of a millimetre. That level of precision matters, because what gets designed digitally is what gets cast in silver.
From the CAD file, we produce a pattern using high-resolution 3D printing. The resin patterns that come out of the printer are extraordinarily faithful to the original design — fine details, clean edges, smooth surfaces. These resin patterns become the physical blueprint for the silver casting. Every petal of the Blossom, every curve of the Flutter butterfly — it's all locked in at this stage.
The short version: modern technology defines the shape. Traditional craft brings it to life in metal.
Building the Tree: Flask Preparation
The resin patterns don't go into the kiln individually. First, they're arranged onto a central wax trunk — called a sprue — that connects multiple pieces together in a cluster. Think of it like a miniature metal tree, with individual charms growing from the branches.
This assembled cluster — the sprue tree — is then placed inside a cylindrical steel flask. The flask is the vessel that will hold the mold material, withstand the kiln, and ultimately be mounted into the centrifugal casting machine. Getting the pieces positioned correctly on the tree matters: each one needs a clear channel for the silver to travel through and a path for trapped gases to escape. Too close together and they interfere with each other. Too spread out and you waste material. The craftsmen who build these trees have been doing it long enough to know the difference instinctively.
The Investment: Locking in the Negative Space
Once the sprue tree is secured inside the flask, the flask is filled with investment — a fine, gypsum-based material mixed with water. Before it sets, the flask goes into a vacuum chamber to pull out any trapped air. This step looks subtle but it's critical: air bubbles in the investment become surface defects in the cast silver. There's no fixing it later.
The investment sets firm around the resin patterns, encasing them completely. Now the flask is ready for the kiln.
The Burnout: Fire Does the Work
The kiln runs at around 700°C. The flask goes in, and over several hours — slowly, deliberately — the heat burns away every trace of the resin pattern inside. It doesn't melt. It volatilises: converts to gas and escapes through the porous investment walls, leaving behind nothing but its own precise, hollow impression.
That hollow space is exactly the shape of the finished charm. An exact negative of the original design. The investment mold is now ready.
The flask comes out of the kiln glowing. Not metaphorically — literally glowing orange at the edges, still at casting temperature. You work fast at this point.
The Pour: Molten Silver Meets the Mold
Sterling silver is melted in a crucible and brought to temperature. Then the hot flask is mounted into a centrifugal casting machine — a device that spins at high speed at the moment of the pour, using centrifugal force to drive the liquid metal into every recess of the mold.
It's fast. It's loud. And it's the moment that everything — all the design work, all the digital precision, all the careful mold preparation — either pays off or doesn't.
The silver fills the mold in a fraction of a second. It follows every surface the resin pattern traced. If the investment is good, if the temperature is right, if the pour goes cleanly: the mold captures all of it. Including the Paw Promise charm's delicate paw print. Including the architectural tension of the Bound charm's interlocked forms.
Then the silver cools, and we wait.
What Happens Next
After the silver sets, the investment mold is broken away — and for the first time, the cast silver sprue tree is visible. That moment, the reveal, is what Part 2 of this series is about.
→ Read Part 2: From Raw Silver to Finished Charm
And if you want to see the people behind all of this — the craftsmen who run the kilns, inspect the trees, and make the calls that no machine can — that's Part 3: The Craftsmen Behind DIVETIA.
The Pieces This Process Makes
Every charm in our debut collection was cast using exactly the process described above. Sterling silver, precision-poured, then set by hand with lab-grown stones.
The Daisy Day charm — our most delicate design — starts at $299 with a lab-grown sapphire or $449 with pink diamond. The Endless charm, at $649, is the one you wear when you want to be remembered.
Every piece is designed to hang from our Classic Necklace ($229) or the adjustable Thread Necklace ($269), both cast in sterling silver through the same process.
