SES Creative 25021 Mine precious stones Excavation. A cool Mine Precious Stones Kit from SES Creative Toys. Excavate your very own precious stones. Build and add to your own rock collection, and learn some fun characteristics of different crystals. Use the safe tools which are comfortable to hold to mine the stones, collect them all! SES has been the specialist in creative toys for more than 40 years. Child development is the central concept in the development of our products. As development is important during the early years, it is important that a child has the opportunity to develop his or her talents and to use their creativity. Besides developing creativity, safety and quality are the most important aspects of all our products! The products we develop are essential to the different developmental stages of any child.