For ages certain gemstones have been designated for anniversaries, some
of the existing lists are in conflict. So, this chart not complete by any means.

1 year:		Peridot, Morganite (Pink Beryl), Aquamarine, Freshwater Pearl
2 years:		Pearl, Jade, Rock Crystal, Rose Quartz, Garnet
3 years		Garnet, Ruby, Chrysoprase, Rock Crystal, Pearl
4 years:		Blue Topaz, Blue Zircon, Moonstone, Amethyst
5 years:		Sapphire, Pink Tourmaline, Carnelian, Turquoise
6 years:		Amethyst, Turquoise, Coral, Garnet
7 years:		Onyx, Sapphire, Golden Beryl, Coral, Lapis Lazuli
8 years:		Tourmaline, Tanzanite, Opal, Aventurine
9 years:		Lapis Lazuli, Amethyst, Green Spinel, Citrine, Tigereye
10 years:		Diamond, Blue Sapphire, Turquoise, Black Onyx
11 years:		Turquoise, Citrine, Yellow Zircon, Garnet, Hematite
12 years:		Jade, Opal, Amethyst, Pearl, Agate
13 years:		Citrine, Moonstone, Hawk's Eye, Malachite
14 years:		Opal, Moss Agate, Bloodstone
15 years:		Ruby, Rhodolite, Garnet, Alexandrite, Rock Crystal
16 years:		Peridot, Red Spinel, Aquamarine
17 years:		Carnelian, Citrine, Amethyst
18 years:		Cat's Eye, Chrysoberyl, Aquamarine, Opal
19 years:		Aquamarine, Red Garnet, Topaz
20 years:		Emerald, Yellow Diamond
21 years:		Iolite
22 years:		Spinel (all colors)
23 years:		Sapphire, Imperial Topaz
24 years:		Tanzanite
25 years:		Tsavorite, Green Garnet
30 years:		Pearl, Diamond, Jade
35 years:		Emerald, Jade, Coral
40 years:		Ruby
45 years:		Sapphire, Alexandrite, Cat's Eye
50 years:		Imperial / Golden Topaz
55 years:		Emerald, Alexandrite
60 years:		Diamond, Star Ruby
65 years:		Blue Spinel, Star Sapphire
70 years:		Sapphire, Smoky Quartz
75 years:		Diamond
80 years:		Ruby