Just a heads up, these are the only gems used in quests, the others you can vendor because that's all they are used for. If its not in the list, its merely vendor fodder and you can sell it... It will save you bag space in the end:
- Black Marble - Priest Breastplate
- Chipped Onyx Sapphire - Priest Legs
- Crushed Black Marble - Melee Boots
- Crushed Coral - Melee Helmet
- Crushed Flame Emerald - Melee Bracer, Priest Boots
- Crushed Flame Opal - Caster Helm
- Crushed Jaundice Gem - Caster Boots
- Crushed Lava Ruby - Priest Gloves
- Crushed Onyx Sapphire - Priest Helm, Caster Bracer
- Crushed Opal - Priest Bracer
- Crushed Topaz - Melee Gloves, Caster Gloves
- Flawed Emerald - Melee Arms
- Flawed Sea Sapphire - Melee Legs
- Flawed Topaz - Caster Arms
- Flawless Diamond - Melee Breastplate
- Jaundiced Gem - Priest Arms
- Nephrite - Caster legs
- Pristine Emerald - Caster Breastplate