Use these molds with with UV Resin or 2part epoxy. with UV Resin you have a quick and easy way to layer colors on top of one another. Some options on these molds have shelf-like layers in them to help you create a variety of layered pieces. Once finished curing those; stick them into the corresponding flatbottom mold piece to finish off your creation into a pendant.
The measuring tape is not included but is added to photos to give you a better understanding of the size of the item.