OVERVIEW
关于玉
史前人类所居住的昏暗洞穴和木屋是玉的文化发源地。 在石器时代，世界各地的人们将这种最为坚硬的宝石打磨成武器、工具、装饰品和礼器。 其雕刻品集结了天地万物的力量以及生与死的神秘力量。
生日石与纪念日
玉是 12 周年纪念日的官方宝石。
CONFUCIUS
The philosopher wrote that jade is like virtue and its brightness represents heaven.
BI
The traditional jade flat disc with a hole in the middle, known as a “bi,” symbolizes heaven.
YU
The character for jade is one of the oldest in written Chinese, dating to 2950 BC.
FACTS
Mineral: Jadeite, Nephrite, Green Omphacite
Chemical composition:
Jadeite: NaAlSi2O6
Nephrite: Ca2(Mg,Fe)5Si8O22(OH)2
Omphacite: (Ca,Na)(Mg,Fe2+,Al)Si2O6
Color: Green, white, orange, yellow, lavender, black
Refractive index: 1.666 to 1.680 (+/-0.008) and 1.606 to 1.632 (+0.009, 0.006)
Birefringence: Usually not detectable
Specific gravity: 3.34 and 2.95
Mohs Hardness: 6.5 to 7 and 6.0 to 6.5
为何钟爱这种宝石
1
Interaction with Light
Jadeite’s structure scatters light. If properly cut, a white piece with a small green spot will make the gem appear completely green if lit from behind.
2
Tough, But Not Hard
Not unusually hard for a gem, both jade types are extremely tough. Neolithic knives and axe heads were often made of nephrite.
3
Musical Jade
Nephrite rings musically when struck. The imperial court in China had jade wind chimes designed to ring specific notes.
品质要素
不管是硬玉还是软玉，绿色都是最珍贵的颜色。 半透明的净度和精细的质地同样会大幅提升玉的价值。
颜色
透明度
质地
切工
克拉重量
硬玉品质要素：综合指南
RESEARCH
Explore sources, gemological research, and the role of gems in history.
RECOMENDED READING
California Jade: The Geologic Story of Nature's Masterpiece
Donald L. Dupras
The John Sinkankas Jade Symposium : April 21, 2007
John Sinkankas Memorial Symposium
Jadeite Jade: A Stone & A Culture
C. M. Ou Yang
.png "彩色钻石")
.jpg "了解校园课程和在线教育")
