I was naturally curious on these new hammers, so, i purchsed one to test it.. DOH! had to buy another (needed 2!) (10g worth - 8g if VIP) then thought i would just test it on a blue gem (doves blood 5g or 4 g if VIP)
The doves blood gives an item +16 attack... the hammers (COMBINED - NOT EACH) gives the item ("embedding properties") 3-10% more.
The end result was i got 4% (from 3-10% anyone suprised numbers so low ?)! then found it was on the solitary gem i embedded.. so the gem cost 4g and gave me +16, the hammers cost 8g and give a +1.
Now, i understand the idea is to use it on uber equipment with uber gems, and i knew before the purchase it would be a bad idea, what i did not realise was just how bad.
Very very bad new item - Developers and/or Publishers please think a little better of your gamers slash clients, this should be a mini boss drop at best - get better numbers from level 1 gems.