The Very Highest Quality Information...


Platinum Alloys Facts and DataClick here to return to FAQ IndexChard 24 Carat Home Page

You can see the quality when it's from Chard!
Platinum Jewellery Alloys
In jewellery, like other precious metals platinum is mixed with other metals to form alloys. Before 1975 there was no requirement for platinum to be assayed and hallmarked in Britain, therefore there was no recognised standard. Because of this, most early pieces marked "plat" or platinum, may be of very variable, and quite low fineness, and most would fail modern assay standards.
Platinum has been hallmarkable in Britain since January 1st 1975. From then until January 1st 1999, the only officially recognised standard of purity or "fineness" in Britain was 950 parts per 1000. From this year, there are now four standards, which are:- 850 900 950 999 parts per thousand.
Typically platinum is alloyed with copper, iridium, palladium, rhodium, osmium or titanium.

Platinum Alloys
The following table gives some typical platinum alloy compositions, shown in parts per thousand.
Metal/1000Metal/1000
Platinum955Copper45
Platinum950Iridium50
Platinum950Ruthenium50
Platinum955Palladium45
Platinum955Cobalt45
Platinum950Gallium
Gold
25
25
Platinum950Gallium
Indium
25
25
Platinum900Iridium100
Platinum900Palladium100
Platinum850Palladium150
Platinum850Iridium150

Platinum Neck Chains

Platinum Facts & Data
Platinum Products

Allergies to Gold Jewellery
Gold Alloys by Weight & Volume
Hallmarking in the UK form January 1st 1999
Hardness & Durability of Gold Alloys
Density of Gold & Other Metals


...at the Lowest Possible Price

32 - 36 Harrowside, Blackpool, Lancashire, FY4 1RJ, England.
Telephone (44) - (0) 1253 - 343081 ; Fax 408058; E-mail:
The URL for our main page is: https://24carat.co.uk
Chard(1964) Ltd