Here are the numbers on Amulets and Belts

I'm not sure this was posted anywhere, numbers pulled from Frosty editor

Amulets of threat generation:

threat on auto attacks: +25%,+50%,+100%

Amulets of threat reduction

threat on auto attacks: -25%,-50%,-75%

Belts of Winter Pact, Inferno Pact and Storm Pact

Elemental Damage +100%,+175%,+250%
Health Reduction -25%,-50%,-75%

Amulets of evasion

chance to evade: 2.5%, 5%, 7.5%

Amulets of barrier

damage taken x30%, x55%, x80% converted to barrier
up to maximum of 1000,1500,2000

Amulets of second wind

On kill 20,35,50 stamina

Belt of retaliation

50% damage returned