Phi jewel, pendant. The model is big, it will support to be reduced. In it's original size the decagon cut is 13.5 mm and the 10 pentagon cuts are 6.8 mm you can take it down until 8 mm for the decagon and and 4.mm for the pentagons. Let me know if you need help with the model. More information about the mathemagical properties of this relationship between decagon and pentagons on https://countingbeauty.weebly.com/geometry.html