Silicone mold square jewels set M008
This silicone jewel set mold for cake decorating includes two shapes, a square jewel that's a little under 1" square, and another that's around 1/2" square.
The mold is made from a food grade silicone, and you can use it for gumpaste, fondant, modelling clay, chocolate, and isomalt. It's safe up to 350 degrees Fahrenheit, and I've used hot isomalt in them with a good result.
You can also use them for polymer clay and other clay media, but if you use them for non-food purposes don't use them for food items after that!