1.
platinum
A precious silvery-white metal used in jewelry, catalytic converters, and various industrial applications. The Japanese name literally means 'white gold'.
In jewelry contexts, プラチナ (the loanword from English/Spanish) is more commonly used in advertising and everyday conversation, while 白金 is the traditional Japanese term used in science and formal contexts. Note: 白金 (read しろかね) is the place name for the Shirokane district in Tokyo. The element symbol is Pt.
Watch out
The kanji read literally as "white gold", but English "white gold" (a gold alloy) is ホワイトゴールド, a different metal. 白金 is always platinum.
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プラチナ (platinum)