If you search hard you can find similar looking jewelry made by up and coming artists-Tarina Tarantino has sold similar necklaces for $300-I recently bought this Hello Kitty "Waterfall" necklace made by T.T. from 80spurple.com
The necklace that you like is VERY Heatherette-but Erickson Beamon makes higher quality jewelry at far cheaper prices and I would not purchase this particular piece at the retail price since it is made of nothing but plastic-I'm sure if you check electricladyland.com regularly-this particular necklace will be reduced in price since this is not a necklace many people would buy (i.e. they will have a hard time selling it and will eventually be forced to mark it down.) These are collector's items, so if you absolutely love it and take care of it immaculately--it will be worth a LOT of money in the future. Check ebay regularly as well.
My Tarina Tarantino necklace:
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Very Heatherette, it reminded me of your necklace which also reminds me of Heatherette even though the necklaces are nothing alike.
photo source as said above: 80spurple.com