However, they may consider "upgrades" of current gems.
I.e. the current gems at their highest item levels are 66. Blizzard may introduce 67, 68, 69 and/or 70.
These "Ultimate" versions of the gems can be crafted when a player acquires the legendary designs from the uber bosses. (Drop Chance shall be subject to Blizzard but will likely follow MP level %). Both the designs and gems are likely to be bind to account.
To craft the gems, you will need 3x Radiant Star quality of the same gem, 1 million gold per cut and 100 tomes of secret.
I imagine variations of the current gems would look something like this if they were to consider upgrades, and without destroying the economy:
1. Ultimate Amethyst -
Helm +20% to Life, Armour and All Resistances
Weapon +5% Chance on hit to apply a "stackable" Vampiric Aura to yourself and your party members for 10 seconds in 40 yards. Heroes affected by vampiric aura gain a 1% lifesteal bonus. This effect is limited to 2 stacks per player in a party and up to a total of 8 stacks for 8% bonus lifesteal.
Other +100 Vit
2. Ultimate Emerald -
Helm +100% Gold from Monsters
Weapon +10% Chance on hit to apply a "stackable" Truestrike Aura to yourself and your party members for 10 seconds in 40 yards. Heroes affected by Truestrike Aura gain 25% more damage. This effect is limited to 2 stacks per player in a party and up to a total of 8 stacks for 200% more damage.
Other +100 Dex
3. Ultimate Ruby -
Helm +2% to all stats (Primary, Vit, Offstats, Resistance, Armour, Attack Speed, Crit Chance - the whole shebang)
Weapon +5% Chance on hit to apply Mortal Wound that lasts for 10 seconds. Heroes affected by Mortal Wound receive up to 100% less healing (based on proc coefficient of ability which triggered the Mortal Wound. (This effect reduces LOH and Lifesteal effects of Heroes, the magnitude of the effect is determined by the highest proc coefficient ability which triggered the effect rather than the duration of the effect)
Other +100 Strength
4. Ultimate Topaz -
Helm +10% chance for monsters to drop an additional item on kill
Weapon +5% Chance on hit to apply Reflective Shielding on yourself for 10 seconds. Reflecting Shielding reflects up to 100% of all damage dealt to you to the attacker (based on proc coefficient of ability which triggered the Reflective Shielding).
Other +100 Intelligence
Hopefully, something along these lines may also add pvp balance into the game...