I play WoW (www.wow-europe.com) quite a lot,
and here are a few things I need to remember, when I want to sell enchantments:

What enchants have glow effects?

+Weapon Damage : All enchants starting at +3 dmg have a blue glow. Higher dmg ->
brighter glow.

Beastslaying / Elemental Slaying : All enchants have a red glow. Higher dmg ->
brighter glow.

Demonslaying : Bright fiery orange glow.

Fiery : Bright fiery red glow.

Icy Chill : Bright white glow.

+9 Int / +9 Spi : Bright yellow glow.

Crusader : Greyish white particle effect.

Lifestealing : Bright purple glow.

Unholy : 2 small green skulls orbit the end of the weapon.

Spell Power : Purple glow.

Healing Power : White glow.

What do high-end enchants do?

Demonslaying : Chance to stun demon and do 100 bonus damage.

Fiery : Chance of +40 bonus fire damage.

Icy Chill : Chance to slow attack speed and movement speed.

Crusader : Often heals the user and increases strength.

Lifestealing : Often steals life and gives it to the user.

Unholy : Curses the target which lowers melee damage.