Hello dear..

 has already mentioned what you are supposed to do. My answer is no different. Skills are more important than the certificates. I have known people who have done double degrees and still are unemployed. I have also come across people who have completed diploma and working in prestigious companies, earning way more than what an engineer is earning in today's corporate field.

So, Yes. You can definitely get a 'great' job if you only do diploma. But, if you have a chance to get higher education, do pursue. Because, education is wonderful. It opens you to infinite amount of knowledge and opportunities. Not college, but education.

All the best...