It is possible to make an alteration to a hallmarked article, subject to the following conditions:
• The altered article must be of the same character and purpose as the original(e.g. a spoon must not become a fork).
• The addition must be of the same standard as the article to which it is being added.
• The weight of the addition must be no heavier than 0.5 grams in platinum,1 gram in gold, 1 gram in palladium, and 7.78 grams in silver.
• The addition must not be greater than 50% of the article’s total weight.
• Any other alterations must be re-submitted to an Assay Office."
hope this helps and doesn't confuse you too much.
kindest,
Wallace
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