There's a mod that enables multiple rings....make sure to read the description, and the comments, like this post from Blackjackgarry:
@skinnydrumma - regarding the problem with 'same rings' and not usable
Well, I also use this great mod. Unfortunatly skinnydrumma is right. Two or more of the same rings (eg Silver Ring) will not be useable. Also, his workaround is not always working. This depends if other crafting mods, eg- JewelCraft (or Tytanis which uses JewelCraft) are installed. In my cas (with Tytanis) I craftet an ebony ring, witch is for the game engine a silver ring!
So what we have here, is a problem ot the interlnal ObjectIDs. These crafting mods seem to use the same IDs as the original rings. In this case you cannot equip these craftet rings twice. As in above example, if I equip my ebony ring, my silver ring gets unequiped - and vice versa.
No Problem (thinking of...) - use another silver ruby ring. Well, now I cannot equip another golden ruby ring... Also, as it seems, if you use ingame vanilla rings (unenchanted ones) its somtetimes working.
So basicly - you have to test and find the combinations that works. Or, wait until CK is out. Hopefully the modders will then try to find a solution...
I found the following ring/jewel combinations (in comb. with mod Tytanis/JewelCraft):
Silver,
Silver Ruby,
Silver Amethyst
Silver Garnet,
Gold,
Gold Emerald,
Gold Diamond,
Gold Sapphire
(and; Gold Amethyst will deselect silver topaz and silver and vice-versa)
So, in case your crafting yourself a half-god character - its not completely working. You will have max 8 crafted/enchanted rings. Enchanted ingame rings are not counted here - but to tailer yourself your rings - only 8 are useable together.
This means not, that you cannot enchant same rings - eg. silver ruby rings - with different enchantments. The rings will be shown separate, but you can only equip one. So, you may tailor somekind of 'sets'. Eg. Rings for archery and sneaking, looting,...
http://www.skyrimnexus.com/downloads/file.php?id=1952
...haven't tried it yet, but I guess your game will still show only 1 ring equipped on your character.