Compiled from discussions on alt.wedding
There are only -8- "true" traditional anniversary gifts in [brackets] The "other" traditional listings are from various sources (consensus) Modern list is from the New York Public Library Desk Reference Alt. modern list is drawn from various sources (consensus)

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Years of Marriage	Anniversary Stones	Traditional	Modern	Alt. Modern
1	Gold Jewelry	[ Paper ]	Plastics	Clocks
2	Garnet	Cotton	Cotton/Calico	China
3	Pearl	Leather	Leather	Crystal / Glass
4	Blue Topaz	Flowers	Linen / Silk / Nylon	Appliances
5	Sapphire	[ Wood ]	Wood	Silverware
6	Amethyst	Candy / Iron	Iron	Wood
7	Onyx	Copper / Wool	Copper / Wool / Brass	Desk sets
8	Tourmaline	Bronze / Pottery	Bronze / Appliances	Linens
9	Lapis Lazuli	Pottery / Willow	Pottery	Leather
10	Diamond Jewelry	[ Tin ]	Aluminum	Diamond
11	Turquoise	Steel	Steel	Jewelry
12	Jade	Silk / Linen	Silk / Linen	Pearl
13	Citrine	Lace	Lace	Textiles / Fur
14	Opal	Ivory	Ivory	Gold
15	Ruby	[ Crystal ]	Glass	Watches
16	Peridot
17	Watches
18	Cat's-Eye Chrysoberyl
19	Aquamarine
20	Emerald	[ China ]	China	Platinum
21	Iolite
22	Spinel
23	Imperial Topaz
24	Tanzanite
25 [Silver Jubilee]	Silver	[ Silver ]	Silver	Silver
30 [Pearl Jubilee]	Pearl	Pearl	Pearl	Pearl
35	Emerald	Coral	Coral / Jade	Jade
40	Ruby	Ruby	Ruby / Garnet	Ruby
45	Sapphire	Sapphire	Sapphire	Sapphire
50 [Golden Jubilee]	Gold	[ Gold ]	Gold	Gold
55	Alexandrite	Emerald	Emerald / Turquoise	Emerald
60 [Diamond Jubilee]	Diamond	[ Diamond ]	Gold	Diamond
70 Sapphire Jubilee	Sapphire
75 [Diamond Jubilee]	Diamond	Diamond	Diamond / Gold	Diamond
Some years are missed, they could be combined onto one necklace, bracelet, earrings, or some type of setting. Another option would be to add a stone to a neckless for each anniversary year. You could develop a 5-year bracelet, a 10-year pendent, or a 20-year necklace.

Links :
The New Advent
Spirituality & Health Magazine Issue: Fall 2002 A String and a Prayer
History of Prayer Beads © IBRAG