Fractal characteristics of tree crown of populus xiaozhuanica in shelterbelts 林带小钻杨树冠的分维结构
The ring was made by 18k sand - washing platinum and two low quality diamonds , the large diamond is 23 / 100 carats and the small one is 10 / 100 carats 介指以18k磨沙白金为圈,配以两粒并不名贵的钻石,大钻石为23份,小钻可为10份。