saphire - 1 - 2000 exp - 5 gems
emerald - 27 - 2720 exp - 4 gems
ruby - 34 - 3400 exp - 9 gems
diamond - 44 - 4320 exp - 28 gems
dragon stone - 55 - 5520 exp - 2331 gems
*uncut gems turns to enchanted amulets
*cut gems subsequently turns to bolt tips
*gem count would have a prior of change when the player cuts any onyx gems.
*no you CANNOT use needle + dragon leather as an alternative way on getting crafting level. [it'll crash your client and when you log on, nothing happens]