Conjure Elemental Weapon

You evoke a one handed elemental weapon in your free hand. The weapon is of a size and shape of any one handed weapon the caster wants it to be, is considered magical for overcoming resistances, and it lasts for the duration. If you let go of the weapon, it disappears, but you can evoke it again as a bonus action during the duration of the spell.

This weapon's elemental damage and esthetic look is decided by the gemstone you consumed to cast this spell. They are as such:                                                                                                  Red: Fire   Blue: Cold   Yellow: Electric   Green: Force   Clear: Air   White: Radiant   Black: Necrotic                                                                                                                                                               

You can use your action to make a melee spell attack with your elemental weapon. On a hit, the target takes 2d8 damage of the evoked element.

When the spell ends, the gem that was consumed to cast the spell reappears in front of the original caster.   

At Higher Levels. When you cast this spell using a spell slot of 4th level or higher, the damage increases by 1d8 for every two slot levels above 2nd.