TEXT: Gem Shield 
  6th level transmutation  
  Casting Time: 1 action 
  Range: Self  
  Components: V, S, M (a gem worth at least 500 gp, consumed in casting) 
  Duration: 1 minute  
   
  A 10ft. diameter crystallized shield appears in front of you (color determined by the type of gem) 
  and provides you with resistance to a certain type of elemental damage (dependent on the gem 
  used).  
  By channeling arcane energy through the chosen gem, the crystallized shield stands between you 
  and any hostiles. The gem has a 60ft. fly speed and you may use your bonus action to move the 
  shield to guard another creature.  
  As an action you can use the shield to target another creature.  Make a ranged spell attack. On a 
  hit the creature suffers 5d8 damage (based on the type of gem).  
  You can extend the duration of the spell by using a more valuable gem. Duration increased by 1 
  minute for every 500 gp above the original price. The shield can be dispelled.  
  Ruby – Fire 
  Sapphire – Cold  
  Emerald – Acid  
  Aquamarine – Lightning  
  Diamond – Psychic  
  Citrine – Thunder  
  Jade – Poison  
   
   
  
SOURCE: textdata/thevault/Dungeons & Dragons [multi]/5th Edition (5e)/3rd Party/DMsGuild/Gem_Shield_-_6th_Level_Wizard_Spell.pdf