d***y
发帖数: 69 | | g******n
发帖数: 53185 | 2 pt比较硬所以可以用很纯的比如pt950。要是用黄金或者white gold只能用18k的。如果
钻石color是D,E可以用黄金的托，颜色差一些的钻石配pt或者white gold的托显得钻石
更白些。pt的一个问题就是很容易dull,戴久了容易失去luster。white gold的问题就
是戴久了表面电镀的rhodium会消失，会显出淡淡的黄色。
HARDNESS AND DURABILITY
In discussions about precious metals people often confuse hardness with
strength, but they are not the same.
Hardness = HV
Often referred to as "scratch resistance," hardness is measured using the
Vickers Hardness scale. This tests the hardness of a metal by pushing a
pointed object into the surface with a specified load and gauging
penetration.
Durability = PSI
Tensile strength, or durability is measured in pounds per square inch.
Comparisons
* 18K Gold = 125 HV…29,000 PSI
* Pt900/Ir = 110HV…55,000 PSI
* Pt950/Ir = 80HV…40,000 PSI
* Pt950/Ru = 130HV…66,000 PSI
* Pt950/Co = 135HV…64,000 PSI
Gold is harder than some platinum alloys and will resist scratches better.
Platinum is almost twice as durable as gold, is more ductile has much
greater longevity. For the body of the piece the differences are not
critical. For the prongs they have implications: For instance, white gold
prongs will break. Yellow gold prongs will bend more, as will platinum, but
platinum prongs are more durable over time. | d***y
发帖数: 69 | 3 解释很清楚,谢谢了.决定选pt950了.
【在 d***y 的大作中提到】
: 谢谢
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