Are there non-physical metals? Because I keep wondering why you call them physical metals, when you can call them just metals.
What is physical metal?
I only know Digital Gold.
Physical ["precious"] metals are basically analog bitcoin. They're heavy, cumbersome physical materials that rich people used to trade for livestock 500 years ago, before the advent of digital gold.
The price of gold and Bitcoin when I started mining BTC Sept 18th, 2013. I really started with the KNC Jupiter ASIC miner on 10/18/2013...but hey, 0.69 BTC on the GPU card counts.

price of gold exactly 0 years start 2013 (more or less) it was $1,348.09 USD and BTC was about $130.86 (more or less) the same/closest day on the charts.
price of gold exactly 1 year later 2014 (more or less) was $1,226.96 USD and BTC was about $475.37 USD (more or less) the same/closest day on the charts.
price of gold exactly 2 years later 2015 (more or less) it was $1,121.32 USD and BTC was about $229.09 (more or less) the same/closest day on the charts.
price of gold exactly 3 years later 2016 (more or less) it was $1,328.57 USD and BTC was about $606.97 USD (more or less) the same/closest day on the charts.
price of gold exactly 4 years later 2017 (more or less) it was $1,327.06 USD and BTC was about $3,630.70 USD (more or less) the same/closest day on the charts.
price of gold exactly 5 years later 2018 (more or less) it was $1,202.50 USD and BTC was about $6,371.30 USD (more or less) the same/closest day on the charts.
price of gold exactly 6 years later 2019 (more or less) it was $1,502.51 USD and BTC was about $ 10,242.27 USD (more or less) the same/closest day on the charts.
The price of gold as of TODAY 11/7/2019 is $1,470.65 USD and BTC is currently today $9,271.90 USD as I type this here.
Using this chart for days closest on such chart (iffy by a day or so) for the price of GOLD historically.
https://www.moneymetals.com/precious-metals-charts/gold-priceUsing this chart for days closest on such chart (iffy by a day or so) for the price of Bitcoin historically.
https://coinmarketcap.com/currencies/bitcoin/Hmmm....good thing I did not listen to all the Gold Bugs who said I needed something 'Tangible' as a store of value.
later
Brad