First Anniversary: paper
Second: cotton
Third: leather
Fourth: books or plants
Fifth: wood
Sixth: iron
Seventh: copper or brass
Eighth: pottery
Ninth: wool
Tenth: tin or aluminium
Eleventh: steel
Twelfth: silk or linen
Thirteenth: lace
Fourteenth: ivory (or plastic)
Fifteenth: crystal
Twentieth: china
Twenty-fifth: silver
Thirtieth: pearl
Fortieth: ruby
Forty-fifth: sapphire
Fiftieth: gold
Fifty-fifth: emerald
Sixtieth: diamond