noun
Used to express the fineness of gold, e.g. 18金性 means 18-karat gold. Often abbreviated as K or kt in written contexts.
この指輪は18金性です。
This ring is 18-karat gold.
金性が高いほど、金の含有量が多い。
The higher the karat, the greater the gold content.
noun
metal-element personality
In Chinese-derived astrology (五行思想), refers to the character traits of a person born under the metal element. Rare outside specialized contexts.
See also: 金 (きん)
彼は金性の持ち主で、決断力があると言われる。
He is said to have a metal-element personality and be decisive.