1. I really should... 2. I promise that I'll... 3. I swear I'll / I won't... (a very strong promise) 4. No matter what happens, I'm going to... 5. Come hell or high water, I'll... #4 and #5 express your determination to do something, even if obstacles appear.
If you see some men carrying hundreds of diamonds in their hands as if they are carrying common stones, you have entered the Mahidharpura diamond market of Surat, Gujarat. People would carry a huge amount of cash and buy diamonds here as if they would be buying groceries. Here the shopkeepers are busy polishing and examining the diamonds, and while you will spend 5 minutes looking, someone would have already exchanged a deal worth hundreds of millions.