There are a lot of options nowadays. The only thing you should do is to choose the one that can suit your DW. For anniversary you can give customize mugs, t shirt,Jewelry,etc. I like these diamond pedants https://www.fjewellery.co.uk/en/pendants/ because most of their shapes can reflect some state or stage of your relations. It is more memorable than any other thing that I have ever come across. Hope it will make sense for you