These are all real gem stones. Most are their natural color, but they are marked if they are dyed. There are no holes, so you need to glue them down. These beautiful little stones are perfect for landscape type projects. For example, use them for paths, to put under flowers, make mounds for rocks amongst the grass. They can also be used on buildings to represent stone. I've used them for the centers of flowers sometimes too! Approx. 25 Grams