Hello,

Diploma Courses in geology can for the following specializations: 

• Economic Geology
• Hydrogeology
• Geomorphology
• Petrology
• Planetology
• Remote Sensing
• Structural Geology 

The above are the specializations for Diploma Courses in Geology. The Indian Institute Of Technology ( Indian School Of Mines) Dhanbad, Jharkhand is the college where you can persue your diploma. 

Hope this Helps !