The Japanese word for gold is
金色

きんいろ - kiniro
金-gold metal, 色-color (iro)

gold

Japanese Definition

金
1. prefix. metal
2. prefix. money
3. prefix. firmness, strength
4. prefix. completely, entirely
5. n. money
⇒ お金, , okane
6. n. metal
7. n. Usage: The (lang-lite, ja, sc=Jpan, 金) spelling is the most common for this term.
8. n. gold
9. n. gold or metal currency: coins, such as 大判 or 小判
10. n. short for 黄金色
11. n. short for 黄金の泥
⇒ 金泥, , kondei
12. n. gold (Au)
13. n. money
金一封をもらった。 - I received a gift of money.
14. n. metal
15. n. one of the five classical elements in traditional Chinese philosophy and medicine: see the "Wu Xing" entry on Wikipedia
16. n. Usage: Often found in compounds.
17. n. one of the five classical elements in traditional Chinese philosophy and medicine: see the "Wu Xing" entry on Wikipedia

黄金
1. n. the metal gold (Au)
2. n. the colour gold
3. n. money, more specifically, the large 大判 gold coins formerly used in Japan.
4. n. Usage: The ōgon reading is the more common on'yomi for this term.
5. n. (obsolete) money
6. n. (obsolete) the metal gold (Au)
7. n. (obsolete) the color gold
8. n. Usage: The ōgon reading is the more common on'yomi for this term.
9. n. (rare) the metal gold (Au)
10. n. (rare) money
In modern Japanese, often refers more specifically to the large 大判 or smaller 小判 gold coins formerly used in Japan.
11. n. Usage: The kogane reading is the more common kun'yomi for this term.
12. n. the metal gold (Au)
13. n. money
14. n. Usage: The kogane reading is the more common kun'yomi for this term.
15. n. the metal gold (Au)
16. n. money
17. n. the color gold
18. n. Usage: The kogane reading is the more common kun'yomi for this term.