Comobo 3 carat Diamond Gambling for Random EQ

Diamond Gambling for Random Equipment
Coal Mine - Buying the 3 Carat Diamonds

Blacksmith Miner
mjolnir_02,85,364
In front of the Coal Mine Entrance (top left corner)
Check world map
Ingredient(s) Product(s)
Not Applicable Not Applicable
First you have to buy 3 carat diamonds from this NPC in front of the Coal Mine Entrance. They are 55,000z each. You can buy as many as you want if you have the zeny.

Comobo - 3 Carat Diamond Gambling for Random Equipments

Kachua
comodo,219,160
A little to the right from the center stage in Comodo
Ingredient(s) Product(s)
3carat Diamond x 1
Not Applicable
If you offer her a piece of 3 carat diamond, she will reward you with a random piece of equipment. It could be something very common (i.e. a Cap) to something semi-rare (i.e. Manteau[1]). Of course, the chance of getting something common is higher and chance of getting rare item is lower.

You can choose your reward in six categories. There are weapon, body armor, robe, headgear, footgear, or shield categories you can pick from.

The good part is that you will not get junk items like jellopy or shell.