Saw these last night at a fair and went home with a 5 wick one from Fire Stone Design.
Each stone is unique - made from marble or granite and hand crafted in the USA. They don't get hot and therefore work well on any table, by the bath, on the night stand or writing desks. Adjust the wick length for outdoor use.
The photos here don't fully capture how lovely they look or the quality of the soft light that they throw off. But if this is the thing you've been looking for I know you can tell they will be great.
As you can see above, there are several types of color combinations. They also offer them in shapes, like hearts, teddy bears, horses, and celtic crosses or as states like Texas or California. They even have some with animal figurines for pet keepsakes, and can do inscriptions. They even make a Wedding unity candle version. You'll find those under the Specialty Gifts tab. So be sure to click through all the site has to offer until you find what you want.