There is no player-obtainable raw gem named Tourmaline, so there are no craftable designs for them. However, there are a number of cut tourmaline gems available from vendors.

Red, match sockets.
Name	Effect
[Bold Tourmaline]	+4 Strength
[Bright Tourmaline]	+8 Attack Power
[Delicate Tourmaline]	+5 Spell Power
[Runed Tourmaline]	+4 Critical Strike Rating
[Teardrop Tourmaline]	+5 Spell Power

v • d • e Socket gems By material Red [Blood Garnet] · [Living Ruby] · [Crimson Spinel] [Bloodstone] · [Scarlet Ruby] · [Cardinal Ruby] [Carnelian] · [Inferno Ruby] · Queen's Garnet† Orange [Flame Spessarite] · [Noble Topaz] · [Pyrestone] [Huge Citrine] · [Monarch Topaz] · [Ametrine] [Hessonite] · [Ember Topaz] · Lava Coral† Yellow [Golden Draenite] · [Dawnstone] · [Lionseye] [Sun Crystal] · [Autumn's Glow] · [King's Amber] [Alicite] · [Amberjewel] · Lightstone† Green [Deep Peridot] · [Talasite] · [Seaspray Emerald] [Dark Jade] · [Forest Emerald] · [Eye of Zul] [Jasper] · [Dream Emerald] · Elven Peridot† Blue [Azure Moonstone] · [Star of Elune] · [Empyrean Sapphire] [Chalcedony] · [Sky Sapphire] · [Majestic Zircon] [Zephyrite] · [Ocean Sapphire] · Deepholm Iolite† Purple [Jaggal Pearl] · [Shadow Pearl] · [Shadow Draenite] · [Nightseye] · [Shadowsong Amethyst] [Shadow Crystal] · [Twilight Opal] · [Dreadstone] [Nightstone] · [Demonseye] · Shadow Spinel† Prismatic [Northsea Pearl] · [Dragon's Eye] · [Siren's Tear] [Chimera's Eye] Meta [Earthstorm Diamond] · [Skyfire Diamond] · [Starfire Diamond] · [Unstable Diamond] [Earthsiege Diamond] · [Earthshatter Diamond] · [Skyflare Diamond] · [Starflare Diamond] [Shadowspirit Diamond] Cogwheels Quest [Shadowy Gem] By category By stats Agility · Intellect · Spirit · Stamina · Strength · Attack Power · Critical strike · Hit rating · Haste rating · Resilience · Spell Power · Spell Penetration · Mana every 5 Seconds · Threat reduction · Defense · Dodge · Parry By source Vendors · Factions · PvP · Quests · Enchanting By quality/stats Uncommon · Perfect uncommon · Rare · Epic † Added in Patch 4.3.