Well I would highly recommend looking at Send the Trend, which has a Groupon deal going on now for 3 accessories for $30!
This is a great deal considering every accessory is priced at $29.99 to begin with! :D
Just watch out for the monthly accessories service...if you sign up for it they will charge you $29.99 a month unless you tell the site to "skip a month" before the 5th of the month. Now I don't know about you, but I would forget to do this...frequently. XP But it is just an option for you after purchasing the 3 accessories, so as long as you opt out, there should be no problems!
Here are some of my recommendations:
If you mother wants pearls, but your a bit more of a modern girl, this Mallory Opalescent Cage Cuff seems to be a wonderful compromise! Classic yet fun, and a great way to bring some bling to your look!

There were so many earrings that I loved, but I have to say these two were my favorites--
Again, another fun play on pearls, modern pearl earring clusters!

And some classic crystal earrings that are so wonderfully elegant!

If you have a more casual look, or want a very understated necklace, this Virginia Love Necklace is just too cute to pass up!

Also, this headband seems to have enough sparkle for a wedding hairpiece, yet is understated, for those who would rather nix the tiara!

So as you can see, Send the Trend seems to cater to a variety of tastes, I would recommend checking them out--you never know what you'll find!
Happy shopping! <3
(As a side note, Send the Trend and Groupon gave me nothing for doing this post, this is just my thrifty opinion!)