Hoy !
Here are the gems that I can do for now:

Blue: Need 'Azure Moonstone' (Pierre de lune azur)
+9 Stamina
+6 Spirit

Green: Need 'Deep Peridot' (Olivine)
+3 Critical Strike Rating +4 Stamina
+3 Spell Critical Rating +4 Spell Penetration

Orange: Need 'Flame Spessarite' (Spessarite de flamme)
+3 Critical Strike Rating +3 Strength
+7 Healing Spell +3 Intellect

Red: Need 'Blood Garnet' (Grenat sanguin)
+13 Healing
+6 Strength
+12 Attack Power

Purple: Need 'Shadow Draenite' (Draénite ombreuse)
+4 Spell Damage + 4 Stamina
+7 Heling Spell +1 mana per second

Yellow: Need 'Golden Draenite' (Draénite dorée)
+6 Intellect
+6 Spell Critical Rating