I think the metallic in the Mosaic is silver and the yellow/orange part is not metallic.
Michael C Fina website has good pictures of each piece in many Hermes patterns. I used it a lot when selecting my china (rythme red and cheval d'orient)
http://www.michaelcfina.com/tableware/formal-china/banded/hermes-mosaique-au-24-CHHERMMO24.html
Thank you so much for clarifying which color is metallic! I think in that case, I will go with the more 'golden' pattern I saw at my boutique Looking forward to browsing this link as well.