A flat alloy sample of 12 millimetres diameter or 12 millimetres by 12 millimetres square is needed to measure the colour. As a precautionary note, when white gold is alloyed with nickel, nickel-sensitive consumers may react to the nickel in the alloy when the jewellery is worn.
No limit has been set for the nickel content of items in direct and prolonged contact with the skin. The requirements in the regulations refer only to nickel release. There is no simple relationship between nickel content and nickel release — the amount of nickel released from a particular jewellery item may be influenced by a number of factors, so it is not possible to state which alloys will be compliant, based on their composition alone. Note: The suitability of the resulting alloy for jewellery manufacture is also a crucial consideration. Premium white category: Standard white category: If silver is to be replaced with other alloying elements then the following norms may be followed: Approximate effect of whiteners: one per cent silver is equivalent to one per cent zinc, 0.
OR There is less scope to create white 22ct gold due to the small amount of non-gold content which is permissible. However Dippal holds a Masters degree MSc in inorganic chemistry and has over 20 years of experience in assaying and the examination of precious metals and alloys.
Basic guidelines for alloy compositions to achieve specific colour grading
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White Gold vs Yellow Gold – Which is Better?
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