Casting, Moulding and Metal Forming in Jewellery Production

Before a jhumka can be plated or a choker set with stones, its metal parts must be formed. Jewellery makers use several methods (casting, die-casting, stamping and wire forming), each with its own strengths. This educational guide explains how they work and how they influence the jewellery you buy.

Safety note: Metal casting involves molten metal, furnaces, investment powders and other hazards. It should be carried out only by trained people in properly equipped workshops with protective equipment and ventilation. This article explains industrial processes; it is not a home how-to guide.

Lost-wax (investment) casting

Lost-wax casting is one of the oldest metalworking techniques, used for thousands of years and still central to jewellery making.

How it works

1. Wax model: a wax copy of the design is made, by hand carving, injection into a rubber mould, or 3D printing.
2. Wax tree: many wax models are attached to a central wax stem.
3. Investment: the tree is placed in a flask and surrounded with a plaster-like investment material.
4. Burnout: the flask is heated in a kiln; the wax melts and burns away, leaving cavities.
5. Pouring: molten metal (such as brass) is poured or forced into the cavities, often with vacuum or centrifugal assistance.
6. Devesting: once cooled, the investment is broken away.
7. Cutting and finishing: pieces are cut from the tree and cleaned.

Strengths

• Captures fine detail, ideal for traditional motifs, filigree-effect and temple designs
• Works with many metals
• Suitable for small and medium production runs

Quality signs

• Crisp detail with no porosity (tiny holes) on visible surfaces
• Clean removal of sprue points
• Consistent thickness

Rubber and silicone moulds

To make many wax copies, a master model is pressed into vulcanised rubber or silicone to create a mould. Wax is then injected into the mould repeatedly. Good moulds are key to consistent production.

Die-casting

How it works

Molten alloy, typically zinc-based, is injected under pressure into hardened steel dies. The die opens and the part is ejected.

Strengths

• Very fast and economical for large quantities
• Good surface finish and repeatable detail

Considerations

• Steel dies are expensive, so it suits high-volume designs
• Zinc alloy parts can be less strong than brass

Stamping and pressing

How it works

Sheet metal is cut (blanked) and shaped by dies in presses. Two halves can be stamped and joined to form hollow shapes, such as lightweight jhumka domes or beads.

Strengths

• Lightweight, hollow forms that reduce weight
• Fast and consistent
• Embossed patterns can be pressed into the surface

Considerations

• Thin walls can dent
• Joins between halves need careful soldering and finishing

Wire forming

Wire can be bent, coiled, twisted and hammered into links, hooks, jump rings, chains and decorative shapes, by hand or machine. Chain-making machines produce long lengths of uniform chain.

See Beading and Wire Wrapping for safe DIY wire techniques.

Fabrication by hand

Skilled artisans also build jewellery from sheet and wire using sawing, filing, forming and soldering. This allows unique, handcrafted pieces. See Handmade vs Machine-Made Jewellery.

3D printing in modern production

3D printers produce precise wax or resin models for casting, allowing complex designs and fast prototyping. Some fashion jewellery is also printed directly in resin or metal.

Comparing methods

How this affects what you buy

• Heavy, intricate traditional pieces are often cast.
• Very lightweight large earrings often use stamped hollow parts.
• Inexpensive, high-volume fashion pieces are often die-cast zinc alloy.

Understanding this helps you interpret weight, detail and price. See How to Identify Quality Imitation Jewellery.

Key takeaway

Casting captures detail, die-casting delivers volume, stamping creates lightness and wire forming creates links and chains. Each method shapes the look, weight and durability of the jewellery you wear.

Written by

HANSINI369 Editorial Team

Our editors research jewellery types, materials, care and craft, and review guides when materials, standards or recommendations change. Read our editorial policy.