Lapis Drop Locations ( most commonly associated )
L1 Lapis - PvP 1-15 wilderness mobs
L2 Lapis - PvP 20-30 wilderness / dungeon mobs ( Maze of Rapioru (F) / Temple of Pharos (L) )
+ some wilderness mobs in PvP 1-60
L3 Lapis - some wilderness mobs in PvP 1-60
+ PvP 1-60 Dungeon mobs in Deep Water 1 (aka D1)
L4 Lapis - PvP 1-60 Dungeon mobs in Deep Water 2 (aka D2)
+ Map 4 Quest
L5 Lapis - Map 3 dungeon mini bosses ( Aurizen Ruins (F) / Cave of Stigma (L) )
+ Map 4 Quest
L6 Stat Lapis - Haruhion (F) / Freezing Mirage (L)
L6 Debuff Lapis - Fantasma Dragon (F) / Cloron Dragon (L)
+ Map 4 Quest
Elemental - Kimakura (PvP 1-60 D2 boss on level 3) and map 3 mobs (uber-rare chance)
Dual Safe, Shrewd, Fortune - Deep Desert 1 (aka DD1)
Dual Craft, Mystic, Wise - Stable Erde (aka The Jungle) (only from Dino, Croc, Giant Turtles)
Accessory Lapis (Act, Rasio, Inter, etc) - Deep Desert 2 (aka DD2)
Flash / Sonic / Perfect - only AP Promo and/or Event reward
'Force' Lapis (BullworkForce, WizardForce, HeatForce) - Shaiya Premium Package
+ as AP Promo and/or Event reward

LAPIS CHART IMAGE (click to enlarge)