First download the secret IGG client from IGGs website that lets you purchase gem packs using diamonds.
Notice the 30 day pack normally costs $10 USD or 10.99 Euros
Change country to Republic of Korea in the top corner
Click on Money bookers/Skrill to see the rates in Korean currency. 9990￦ for 999 gems.
Pay for your diamonds.
Note: Skrill is a european company so you will be charged in Euros for the equivalent of 9990 won. There are no currency exchange fees or anything you will just be charged at the current exchange rate. for example 9900 won is currently €7.60 Euros. Your card will be charged 7.60 euros. You will essentially pay 7.60 euros for the €10.99 package. Roughly a 30% discount.
Final step. Punch yourself in the face for having been scammed by IGG and overpaying for your gems for the past 12 months.