The Definitive Guide to 婚戒
The area of diamonds is partially oxidized. The oxidized floor may be diminished by heat treatment method less than hydrogen circulation. That is definitely to mention, this warmth treatment method partially gets rid of oxygen-containing practical groups.鋸 · 磨 · 焊 · 鍛 · 拋 · 鑲 · 鍍 · 失蠟法 · 鑄造 · 浸滲