From Diablo Wiki
Regular (or Normal) gems are the 3rd rank of gems. In the game this level of gem is simply called by the type of gem, e.g. "Ruby" or "Diamond," but fans refer to them as Normal or Regular gems to clarify the rank or level of gem, not just the type.
Regular gems drop from targets (monsters, chests, Treasure Goblins, etc) that are around level 26-30.
Regular gems can be found or upgraded from Flawed gems, and upgraded to Flawless gems via the Jeweler.
- 2 Flawed gems (same type) + 25 gold = 1 Regular gem
- 2 Regular gemss (same type) + 40 gold = 1 Flawless gem
A full list of gems by ascending rank. Drop levels are approximate up to 60, with some overlap between each ascending level of gem. For example, targets (monsters, chests, Goblins, etc) around level 42-43 will drop either Perfect gems or Radiant gems.
- Chipped gem -- Drops from level 15-20 targets.
- Flawed gem -- Drops from level 21-25 targets. ]
- Regular gem -- Drops from level 26-30 targets.
- Flawless gem -- Drops from level 31-36 targets.
- Perfect gem -- Drops from level 37-42 targets.
- Radiant gem -- Drops from level 43-48 targets.
- Square gem -- Drops from level 49-54 targets.
- Flawless Square gem -- Drops from level 55-60 targets.
- Perfect Square gem -- Upgrade only.
- Radiant Square gem -- Upgrade only.
- Star gem -- Upgrade only.
- Flawless Star gem -- Upgrade only.
- Perfect Star gem -- Upgrade only.
- Radiant Star gem -- Upgrade only.
- Marquise gem -- Upgrade only in D3: Drops lvl 61+ in Reaper of Souls.)
- Imperial gem -- RoS-only. Upgrade, or rarely drops from lvl 61+ on Master+ difficulty.
- Flawless Imperial gem -- Upgrade only. RoS only.
- Royal gem -- Upgrade only. RoS only.
- Flawless Royal gem -- Upgrade only. RoS only.
Regular Gem Stats
|Regular Amethyst||+7% Life||+14 Vitality||Each Hit Adds +6 Life|
|Regular Diamond||Reduces cooldown of all skills by 4.5%||+14 Resistance to All Elements||Increases damage against Elites by 4%|
|Regular Emerald||+9% Increased Gold Find||+14 Dexterity||Critical Hit Damage Increased by 20%|
|Regular Ruby||Increases Bonus Experience by 9%||+14 Strength||+9 Damage|
|Regular Topaz||9% Better Chance of Finding Magical Items||+14 Intelligence||Melee and Ranged attackers take 6 damage per hit.|
See the gems page for stats and upgrade costs for every level of gem.
|Items of Diablo III  Item Basics Normal Items Crafting Legendary Armor I Legendary Armor II Legendary Weapons 1h Legendary Weapons 2h Item Sets|
|Item Basics||Item Affixes||Interface||Artisans||Miscellaneous |
• Prefixes & Suffixes
|Diablo 3 and Reaper of Souls Item Sets||Reaper of Souls only |
Crafted Item Sets
Crafted Item Sets
Themed Item Sets