Here are my completed series in reading order.

Series Included

Onyx World

A Fate in Moonstone, A Secret In Onyx, A Truth In Ruby, A Destiny in Sapphire.

Second Gen Trilogy 

The Tragedy of Jade, The Rise of Quartz, The Rule of Garnet.

Hero Society

Dawn, Day, Dusk, Night 

Hero Society Collection 1

Hero Society Seasons(standalones) 

Fall, Winter, Spring, Summer