Gold is a metal which is commonly used as a metal in jewellery and piercings.
Gold allergy has also been noted after procedures to have dental gold used in fillings.
24 carat gold jewellery has less than 0.1% other metals in the alloy. The amount of other metals increases with decreasing carat level, 18 carat gold has 25% other metals, 12 carat gold has 50% other metals and 9 carat gold is made up of more than 60% other metals. An allergy to a lower carat gold may be to another metal present.
I have put together some more comprehensive resources at http://www.allergyresources.co.uk/Gold.php
The allergy resources page for gold covers the key allergens, which allergic syndromes are linked to this allergy and other foods which are commonly cross reactive with gold .
There is also regularly updated links to useful websites specifically for gold allergies and the latest research papers on the topic.
If you have multiple allergies and are interested in how they are linked or want to find out more about food allergies outside the usual top 14 then you can follow me on Facebook or Twitter, where I share a food allergy card every day of the week.