See bottom of post for update.
Miu Miu's knot sandal with jeweled heel retails for $815 at Bergdorf Goodman.
Although they don't have the jeweled heel (making them a bit more wearable in my opinion), these Liv t-strap platforms by No. 704b at DSW retail for a less expensive $109.95. They are also available in black and you can click on the photo below if you're interested in purchasing.
*Update - 5/18/10* - Go Jane also has a lookalike (minus the jeweled heel) which retails for $21.90 (on sale). Also available in white, click here to purchase.