Poetry and figurative language questions

Hello. I’m hoping you can help me out. I’ve been doing some research on my own, but I wanted to know:
What flowers, metals, minerals, gemstones, animals, spices and garnishes and objects are used in the figurative sense as terms for people, and as nicknames?
What are poetic synonyms for gold and silver?
Please let me know. Thank you.

JGoldman10@email.com