Most people are well aware of the traditional materials offered to married couples to celebrate their wedding anniversary. You know the kinds of thing I mean – ruby for instance is the gem of choice for a 40th anniversary, although why a chunk of chromium infested aluminium oxide should have been chosen for this year in particular I don’t know. The noble elements silver and gold are 25th and 50th respectively, while the hardest allotrope of carbon, represents the 60th celebration (diamond, that is). If you want the complete list check out our traditional wedding anniversary gifts page, but if you want something a little different, a reference for Kevlar, zeolites, buckyballs, or PVC say, take a look at our chymical wedding round-up.