The Samsung Galaxy S4 Crystal Edition is based on the white I9500 (that's the Exynos 5-powered one) and features a unique back with studded Swarovski crystals.
It will set you back 20,300 baht ($630/€460) and you can only get it from the Samsung Shop. For comparison, a standard I9500 S4 costs around 17,400 baht ($540) in Thailand.
Thanks for the tip, Todty!
Source (in Thai)