2020UNE-EN ISO 8654:2018/A1:2020 Jewellery - Colours of gold alloys - Definition, range of colours and designation - Amendment 1 (ISO 8654:2018/Amd 1:2019)
2018UNE-EN ISO 8654:2018 Jewellery - Colours of gold alloys - Definition, range of colours and designation (ISO 8654:2018)