Diamond Eye

About
The Diamond Eye is a building unlocked at level 13. It has 3 stages to build. It costs 80,000 coins.

Building
1st stage: 2nd stage: 3rd Stage:
 * 20 Palm Logs
 * 15 Cable (Crypt)
 * 25 Black Marble
 * 10 Gold Petal (University)
 * 5 Light (Library)
 * 15 Cement (Mill)
 * 20 Aquamarine
 * 10 Bricks (Villa)
 * 5 Polystyrene (Business Center)

Treasure Loot
This data is not particularly accurate, but should give a good indicator of what to expect. Building it to stage 2 and transforming it would reward stage 0, then stage 1, then stage 2, and then it would be done. (Tested with stage 0, 1, and 3). Note that since stage 0 rewards gold, the cost of 80k is partially refunded.

Stage 0
~750 exp ~10k gold

Stage 1
50 common Collection Items

Stage 2
~20 Iron Heart, Transformers etc.

Stage 3
~750 exp ~30 Stars 30 Super Swords