Macro to cast if I already have Jade in invatory

So I want to cast the three conjures I have.
example…

/cast Conjure Mana Agate
/cast Conjure Mana Citrine
/cast Conjure Mana Jade

So It cast Agate, if I have an Agate, then it cast the Citrine, the next line.
But this macro don’t work, I need if commands I guess.

Can someone make this work for me.

Cause this works…

/use Mana Citrine
/use Mana Agate
/use Mana Jade

It uses Citrine, puts me on CD then after CD and I press again it will use the Agate, cause the Citrine is gone.

Help…

Thank you.

PS: this is for Classic…