The list is relatively the same across industries. My thought has always been to pair the gift with what is appropriate for the person, or whatever gift you find.

The Traditional gifts go up through a 15th Anniversary, then drop out until the big numbers, while the Modern gifts keep individual years a little better. After 60, the gifts pretty much stick to one form or other of Diamond.
Hope this helps!

Traditional Modern
1 Paper Clocks
2 Cotton China
3 Leather Crystal
4 Fruit or Flowers Appliances
5 Wood Silverware
6 Candy or Iron Wood
7 Wool or Copper Desk Sets
8 Bronze or Pottery Linens or Lace
9 Pottery and Willow Leather
10 Tin or Aluminum Diamond Jewelry
11 Steel Fashion Jewelry
12 Silk or Linen Pearls
13 Lace Textiles or Furs
14 Ivory Gold Jewelry
15 Crystal Watches
16 Silver Hollowware
17 Furniture
18 Porcelain
19 Bronze
20 China Platinum
21 Brass or Nickel
22 Copper
23 Silver Plate
24 Musical Instruments
25 Silver Silver
30 Pearl Diamond
35 Coral Jade
40 Ruby Ruby
45 Sapphire Sapphire
50 Gold Gold
55 Emerald Emerald
60 Diamond Diamond