My most recent order was for a seventh anniversary gift in copper, one of the traditional seventh anniversary gifts.
A fair number of other metals also feature as traditional anniversary gifts. For the full list of gifts which includes not only metals but gemstones and other items, look over here. Here’s my summary for metals plus my personal note re availability:
For further ideas, look at the list of modern gifts which coincide here and there with the traditional list.
Here’s another list which sets out the traditional and modern lists side by side – there are many references to metals in the modern list: https://anniversariesbyyear.com/. Some of the other gifts are quite amusing!
Here’s my modern list summary for metals:
In : Personalised jewellery