update....better quality:

ISO 8653:2016 Jewellery -- Ring-sizes -- Definition* measurement and designation
ISO 11489:1995 Determination of platinum in platinum jewellery alloys -- Gravimetric determination by reduction with mercury(I) chloride
ISO 11490:2015 Jewellery -- Determination of palladium in palladium jewellery alloys -- Gravimetric determination with dimethylglyoxime

still nothing missing here

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