Jane well done.
chatty take him with you to buy the ring.For him, well, what is he into?Is he a gardener? There is a Ruby Anniversary rose either as a standard or tea rose.You could buy him 6 if you have the room, to be planted all together.If you wanted to splash out, buy a sun dial, then you could have the Ruby roses planted in a circle around it.Thus marking the passage of time with your love...( can't believe I just wrote that, perhaps I could get a job with Hallmark cards.)
We didn't buy each other a present for ours ( nothing we wanted) but we had a party and friends/relatives bought us the roses, ruby glassware ( very pretty) and red wine ( even better!)