I made a spreadsheet where you can see what cuts are available and what stats you can get on them:
http://spreadsheets.google.com/pub?key=pbOBtAGDg3ZjJGzcUWyHVSA&hl=en_GB
If you're scared of spreadsheets, here's the same info in WALLOFTEXT format:
RAW GEMS
Miners will sometimes get these gems from nodes, otherwise jewelcrafters prospect them out of raw ore. The simple gems are found in clams or can be bought (occasionally) from a gorloc vendor in the Borean Tundra. The Dragon's Eye is a vendor-bought gem only jewelcrafters can use.
RED STATS
Names in parentheses are the names of the (purple) (red) (orange) cuts. For example, a Shifting cut gem is a purple gem with Agility as one of its two stats.
YELLOW STATS
Names in parentheses are the names of (orange) (yellow) (green) cuts. For example, a Deadly cut gem is an orange gem with Crit as one of its two stats.
BLUE STATS
Names in parentheses are the names of (green) (blue) (purple) cuts. For example, a Dazzling cut gem is a green gem with MP5 as one of its two stats.
PURPLE CUTS
Hybrid gems will cut into jewels with two stats (one red, one blue - see above).
ORANGE CUTS
Hybrid gems will cut into jewels with two stats (one red, one yellow - see above).
GREEN CUTS
Hybrid gems will cut into jewels with two stats (one yellow, one blue - see above).
META DIAMONDS
Alchemists can transmute two kinds of diamonds, which a jewelcrafter can then cut into a metagem.
To get an Earthsiege Diamond: transmute uncommon Orange gem + Green gem + Eternal Fire
To get a Skyflare Diamond: transmute uncommon Red gem + Blue gem + Eternal Air
You can also buy Earthshatter/Starflare Diamonds in Wintergrasp for Stone Keeper's Shards. They are already cut, but have weaker primary stats than the equivalent jewelcrafter cut ones.
http://spreadsheets.google.com/pub?key=pbOBtAGDg3ZjJGzcUWyHVSA&hl=en_GB
If you're scared of spreadsheets, here's the same info in WALLOFTEXT format:
RAW GEMS
Miners will sometimes get these gems from nodes, otherwise jewelcrafters prospect them out of raw ore. The simple gems are found in clams or can be bought (occasionally) from a gorloc vendor in the Borean Tundra. The Dragon's Eye is a vendor-bought gem only jewelcrafters can use.
- Red: Scarlet Ruby / Bloodstone
- Orange: Monarch Topaz / Huge Citrine
- Yellow: Autumn's Glow / Sun Crystal
- Green: Forest Emerald / Dark Jade
- Blue: Sky Sapphire / Chalcedony
- Purple: Twilight Opal / Shadow Crystal
- Simple: Siren's Tear / Northsea Pearl
- Prismatic: Dragon's Eye
RED STATS
Names in parentheses are the names of the (purple) (red) (orange) cuts. For example, a Shifting cut gem is a purple gem with Agility as one of its two stats.
- Agility: (Shifting, Tenuous) (Delicate) (Deadly, Deft, Glinting, Lucent)
- AP: (Balanced, Infused) (Bright) (Empowered, Pristine, Stark, Wicked)
- Armor Penetration: (Puissant) (Fractured) (-)
- Dodge: (Regal) (Subtle) (Stalwart)
- Expertise: (Guardian's) (Precise) (Accurate, Resolute)
- Parry: (Defender's) (Flashing) (Glimmering)
- Spellpower: (Glowing, Mysterious, Purified, Royal) (Runed) (Durable, Luminous, Potent, Reckless, Veiled)
- Strength: (Sovereign) (Bold) (Champion's, Etched, Fierce, Inscribed, Resplendent)
YELLOW STATS
Names in parentheses are the names of (orange) (yellow) (green) cuts. For example, a Deadly cut gem is an orange gem with Crit as one of its two stats.
- Crit: (Deadly, Inscribed, Potent, Wicked) (Smooth) (Jagged, Misty, Radiant, Sundered))
- Defense: (Champion's, Glimmering, Resolute, Stalwart) (Thick) (Enduring)
- Haste: (Deft, Fierce, Reckless, Stark) (Quick) (Energized, Forceful, Intricate, Shattered)
- Hit: (Accurate, Etched, Glinting, Pristine, Veiled) (Rigid) (Lambent, Shining, Tense, Vivid)
- Intellect: (Luminous) (Brilliant) (Dazzling, Seer's, Timeless)
- Resilience: (Durable, Empowered, Lucent, Resplendent) (Mystic) (Opaque, Steady, Turbid)
BLUE STATS
Names in parentheses are the names of (green) (blue) (purple) cuts. For example, a Dazzling cut gem is a green gem with MP5 as one of its two stats.
- MP5: (Dazzling, Energized, Lambent, Opaque, Sundered) (Lustrous) (Infused, Royal, Tenuous)
- Spell Penetration: (Radiant, Shattered, Tense)(Stormy) (Mysterious)
- Spirit: (Intricate, Misty, Seer's, Shining, Turbid) (Sparkling) (Purified)
- Stamina: (Enduring, Forceful, Jagged, Steady, Timeless, Vivid) (Solid) (Balanced, Defender's, Glowing, Guardian's, Puissant, Regal, Shifting, Sovereign)
PURPLE CUTS
Hybrid gems will cut into jewels with two stats (one red, one blue - see above).
- Tenuous: agility/mp5
- Shifting: agility/stamina
- Infused: AP/mp5
- Balanced: AP/stamina
- Puissant: armor penetration/stamina
- Regal: dodge/stamina
- Guardian's: expertise/stamina
- Defender's: parry/stamina
- Mysterious: spellpower/spell penetration
- Royal: spellpower/mp5
- Purified: spellpower/spirit
- Glowing: spellpower/stamina
- Sovereign: strength/stamina
ORANGE CUTS
Hybrid gems will cut into jewels with two stats (one red, one yellow - see above).
- Deadly: agility/crit
- Deft: agility/haste
- Glinting: agility/hit
- Lucent: agility/resilience
- Wicked: AP/crit
- Stark: AP/haste
- Pristine: AP/hit
- Empowered: AP/resilience
- Stalwart: dodge/defense
- Resolute: expertise/defense
- Accurate: expertise/hit
- Glimmering: parry/defense
- Luminous: spellpower/intellect
- Potent: spellpower/crit
- Reckless: spellpower/haste
- Veiled: spellpower/hit
- Durable: spellpower/resilience
- Inscribed: strength/crit
- Champion's: strength/defense
- Fierce: strength/haste
- Etched: strength/hit
- Resplendent: strength/resilience
GREEN CUTS
Hybrid gems will cut into jewels with two stats (one yellow, one blue - see above).
- Sundered: crit/mp5
- Radiant: crit/spell penetration
- Misty: crit/spirit
- Jagged: crit/stamina
- Enduring: defense/stamina
- Energized: haste/mp5
- Shattered: haste/spell penetration
- Intricate: haste/spirit
- Forceful: haste/stamina
- Lambent: hit/mp5
- Tense: hit/spell penetration
- Shining: hit/spirit
- Vivid: hit/stamina
- Dazzling: intellect/mp5
- Seer's: intellect/spirit
- Timeless: intellect/stamina
- Opaque: resilience/mp5
- Turbid: resilience/spirit
- Steady: resilience/stamina
META DIAMONDS
Alchemists can transmute two kinds of diamonds, which a jewelcrafter can then cut into a metagem.
To get an Earthsiege Diamond: transmute uncommon Orange gem + Green gem + Eternal Fire
To get a Skyflare Diamond: transmute uncommon Red gem + Blue gem + Eternal Air
You can also buy Earthshatter/Starflare Diamonds in Wintergrasp for Stone Keeper's Shards. They are already cut, but have weaker primary stats than the equivalent jewelcrafter cut ones.
- Austere Earthsiege: stamina/armor
- Beaming Earthsiege: crit/mana
- Bracing Earthsiege: spellpower/subtlety
- Chaotic Skyflare: crit/crit bonus
- Destructive Skyflare: crit/spell reflect
- Effulgent Skyflare: stamina/mitigation
- Ember Skyflare: spellpower/intellect
- Enigmatic Skyflare/Starflare: crit/reduced snare
- Eternal Earthsiege: defense/block
- Forlorn Skyflare/Starflare: spellpower/reduced silence
- Impassive Skyflare/Starflare: crit/reduced fear
- Insightful Earthsiege: intellect/mana restore
- Invigorating Earthsiege: AP/proc heal
- Persistent Earthshatter/Earthsiege: AP/reduce stun
- Powerful Earthshatter/Earthsiege: stamina/reduce stun
- Relentless Earthsiege: agility/crit
- Revitalizing Skyflare: mp5/bonus crit heal
- Swift Skyflare/Starflare: AP/run speed
- Thundering Skyflare: proc melee haste
- Tireless Skyflare/Starflare: spellpower/run speed
- Trenchant Earthshatter/Earthsiege: spellpower/reduce stun