gold
金 centers on the metal gold, both as a material and as a symbol of value. It is the core idea behind money and metallic things in general.
gold (metal)
money
money
funds; capital
finance; financing; credit transacting; loaning of money; circulation of money
fee; charge; fare
cash; ready money; money on hand; currency
metal
rich person; wealthy person
amount of money; sum
debt; loan; liabilities; borrowing money
annuity; pension
Friday
Friday
gold
gold (Au)
tax; duty
putting money aside; savings; deposit (e.g. in a bank)
wages; pay
prize money; monetary award; reward
money; cash
blond hair; blonde hair; golden hair
interest rate; interest
refund; repayment; reimbursement
金 originally depicted metal pieces in the ground, with the top representing a cover or roof and the lower part showing nuggets or ingots. The modern form retains this general structure.
The top looks like a roof covering something valuable, and the lower part shows shiny nuggets or bars. Together they form the image of gold hidden under a shelter.
For キン, imagine a king's golden crown: king -> キン, and the crown is made of pure gold.