Model created in the program Autodesk Maya 2018/ Сreate a new project in your program and import the STL file or other format/ pendant/ size 20*15*2. mm. diameter of stones 2.75 mm. model consists of 2 parts the 3D model is prepared for production/ pendant is prepared for processing on CNC dimensions of the workpiece 20.5*2.5*15.5 mm.
Enjoy/