Taiwan's jade is as hard as that found in Canada and Korea, but it is greener because of its higher chromium content.
當時曾有商人欲以加拿大玉冒充這兩個洞的玉外銷，均被發現而遭退貨。台灣翠玉一般分為普通玉、蠟光玉、和貓眼玉三種，硬度與加拿大玉、韓國玉相同，顏色則因含鉻較多，而比加、韓兩國的玉翠綠。