Create an LTspice image:

$1.$ silicon diode $(1$n$4004)$: series circuit with a $390$ resistor and labeled polarity.

$2.$ germanium diode $(1$n$60)$: similar to the silicon diode but indicating its lower forward voltage drop $($~$0\mathrm{.}3$v$).$

$3.$ zener diode $(1$n$746$a$)$: include reverse$-$biased configuration to demonstrate breakdown.

$4.$ red led diode: highlight polarity and typical forward voltage drop $($~$1\mathrm{.}7-2$v$).$