Low - Servants 

Pearls and Citrine are assigned to gems to be servants, opening doors and doing basic tasks. They are also trained in combat if assigned to a diamond or higher class gem so that they may protect them.

Low - Gaurdians

Amethysts/Jaspers are assigned as guards on missions or at stationary bases. If they are the right size and shape then they may receive their own pearl and be sent on missions of more importance. 

Low - Guardians/Pilots

Rubies are assigned to gems who travel a lot, and rubies can be found in packs of three to seven so that they may fuse to act not only as pilots, but as a guard. Topaz are normally larger, so will only come in a group of two.

Crocidolite(Hawk's Eye) are like Topaz, larger yet pilots, though only one will ever accompany another gem on missions.

High - Advisors

These two gems are held in high regard due to their ability to see the future ahead, and though few in number you really should only need one mind reader to win a battle, right? They are small, and normally guarded by Rubies, Pearls, Jaspers, or accompanied by an Aggete, even.

Medium -  Soldiers

Lapis Lazuli gems are very rare in number, and are usually made during times of war due to their destruction and flight capabilities. 

Low - Technitians

Peridots and Emeralds do repairs on ships or help work on new gem technology. They can be assigned on missions but normally stay on home world, unless assigned to a kindergarten to watch progress.

High - Generals

Aquamarines and Morganite are feared and respected. They normally stay on home world unless assigned to watch peridots work on kindergartens. they are normally escorted by at least two topaz or jaspers and/or two pearls.

High - Generals

Agates and Aventurines usually stand base around highly guarded areas to give orders or supervise Jaspers/Ametheysts/Ivorys at work. 

Medium -  Justice

Zicron and Jade give trial to those suspected of treason. They also work with Agets inorder to catch and apprehend said criminals, and may be gifted a pearl if deemed worthy. 

Low - Defects(Messengers)

Copper,  Heliotrope, and Turquoise are the lowest of low gems. Brittle and with little use and have been pushed to being extinct. They work like Pearls would and are sent out on dangerous missions that no other gem would want to do, and are also used as expendable scouts or messengers to enemies or through dangerous areas.  They are created by mistake at first, but now have become a priority to make since their purpose is basically suicide. 

High - Generals/War Advisers 

These gems report directly to their diamonds for orders and oversee production of other planets and will join soldiers in battle with exceptional elemental skill prowess.