Over 300,000 free gems are obtainable in half a month; gem mines are NOT recommended (inefficient, heavy stamina). Ranked free sources: Northern Invaders (Barbarians) Event up to 510,000/event (500M personal score = 255,000; 2B = 510,000). World Boss: up to 300,000/week -- fight 10x/day (6 days/week), up to 5,000/battle (50,000/day); first 5 free, 6th-10th cost 200/400/600/800/1,000 gems (attack only if reward exceeds cost); top-100 damage adds 4,000-10,000. Treasure Hunt (Pyramid): up to 189,000/event; monarch ranking 1st = 300,000. Server War (biweekly): 2,000-84,500 by personal score; top-10 monarch adds 50,000-300,000. Crazy Eggs: ~5,600-75,000/week. Monarch Competition: 3,500+/week. Dwarf's Lucky Apple: 15,000/exchange if lucky. BoC: ~8,000+/week; BoG ~1,000+/week. King's Path Day 2: 100-2,800. Daily logins + 7 weekly Shrine offerings: 2,500/week (spend only the first 25-gem offering daily). Activity score 145 daily: 350-1,000+/week. Undead Invasion ~500+/week. Server Gifts on wall ~700+/week (50 gems at 11:00 and 23:00 server time). Battlefield Shop sells gems for badges (5,000 gems = 110 badges). For a bot, gems fund VIP, Levy-to-gold, and event opens -- so systematically collect the daily/weekly free sources (World Boss, logins, Shrine offering, wall gifts, activity score) and treat events as bulk sources; never spend gems on instant-finish or buying resources.
Original research source: Evony Guide Wiki