what's the use of 2 and 3 karat diamond?

[LuciFurr]

As far as i know only 1 karat and broken diamond are used for crafting..

[salmanfla]

1, 2, 3 karat diamond can be used for crafting, the more karat the diamond has, the less diamond you need to make armor

example: you need 3 pieces of 1 karat diamond to create the armor pouch/box (gives random armor equipment depends on what type of armor you need) 

but you only need 2 pices of 2 karat diamond to create the armor pouch/box (gives random armor equipment depends on what type of armor you need) 

 

otherwise the cracked diamond is used for crafting 105 armor

[LuciFurr]

oh cool  thank you this is very helpful

[SilverDeer]

Adding to salmanfla's comment, it has the same purpose as karat 1 with the only difference in the required amount . Cracked diamond is also used to craft the Fairy Queen bracelets.