With nearly 200 years' experience, we're expert suppliers of outstanding quality and purity precious metal alloys for jewelry manufacturers and craftsmen.

Jewellery Photo
Through extensive research and development, we're forerunners of platinum and palladium technology in the jewelry industry.

Casting Grain

We offer alloyed grains designed specifically for casting, which can also be provided as chopped rod.

Tube

Our ring-sized tubing offers wedding band manufacturers the flexibility to cut, stretch, shrink, weld and work wedding bands and blanks. These are made to your exact specification.

This flexibility comes from our proprietary extrusion process of tube, as opposed to die-striking, which has been developed by our metallurgists over many years to produce reliable products. It also allows us to consistently provide tube with no porosity and a homogeneous grain structure that can withstand the heaviest hot and cold work. Alternatively we can provide the tube hard drawn if preferred.

Our outstanding manufacturing process control means that thin walled tubing for stone setting and fine hand work is also available.

Plate and sheet

Our plate, suitable for handmade and die struck work, is produced in a finish and temper to ensure optimum quality and yield. We can also produce sheet and coiled strip for both fine and heavy stamping requirements such as earring backs and watch cases.

Rods

Our square rod is ideal for fabrication, machining, drawing or simply casting exactly the weight you need. The can be made in the length, quantity and alloy you require.

Wire

We make a range of wire available for repair work or intricate fabrications. Using our precision production techniques we produce burr and tear free wire on a microscopic scale with exceptional strength and the highest quality finish. This can be drawn wire to almost any size and specification, including large scale fine diameters on reels for automated production of chain and similar products.

Rhodium Solution

In the USA we can offer Briteplate™ rhodium sulphate solutions, giving the bright white finish of a precious metal plating. These premium plating salts come with a guarantee of purity, assay and consistency. They are made to a concentration and pack size that meets your exact needs.

Jewelry Alloys

We create a range of alloys that enable easy processing, from casting to final polishing. An overview of these and their properties is given in the following table, but with our extensive knowledge we can provide you with more information and help you find the alloy to best suit your needs.

Alloy

Alloying Elements

Fineness (parts per thousand)

Melting Range (°C)

 

Annealed State Hardness (Hv)

Ductility of Annealed State (% elongation)

Density (g/cm3)

Key Characteristics

Solid

Liquid

Pure platinum

 

999

1769

1769

50

40

21.4

 

HPP platinum

 

999

1769

1769

55

35

21.4

Improved hardness and strength compared to pure platinum

FP platinum

3% copper

970

1740

1755

120

30

20.6

Soft for settings

GW platinum

4.5% copper

955

1725

1745

125
(108 as-cast)

29

20.0

General purpose, medium hard, can be cast

HC platinum

4.5% cobalt

955

1750

1765

135

20

20.8

Fluid for hard castings

SW 950 platinum

5% iridium

950

1780

1790

80

30

21.4

Good fabricating alloy suitable for hand working after casting

SW 900 platinum

10% iridium

900

1780

1790

110

25

21.5

All purpose alloy for casting and machining with good ductility.

SW 850 Platinum

15% iridium

850

1800

1820

160

15

21.5

Springs, watch backs

SC 950 platinum

5% palladium

950

1755

1765

60
(68 as-cast)

22
(22 as-cast)

20.6

Castings, delicate settings

SC 900 platinum

10% palladium

900

1740

1755

80
(72 as-cast)

22
(22 as-cast)

19.8

General purpose

SC 850 platinum

15% palladium

850

1730

1750

90
(64 as-cast)

22
(22 as-cast)

19.1

Chain making

HM platinum

4.5% ruthenium

955

1780

1795

130

32

20.7

General purpose, good wear and polishing characteristics

HS platinum

proprietary

950

1370

1520

300 (220 as-cast)

10

19.4

Hard springy, can be cast for catches

Palladium

5% proprietary

950

1499

1521

125

35

11.8

Hard and durable alloy, suitable for casting. Provides optimal harness and workability.

Palladium

5% ruthenium

950

1558

1580

115

30-35

11.9

Suitable for cold worked pieces, providing hardness and durability

For more information on our jewelry products please contact us, request a quote or fill out an enquiry form.