Your biggest factor as far as earning massive amounts of points in Diamond Dash is how many of the diamond bombs you earn and use. Every time you clear off a combination of diamonds you fill a bar at the top of the screen, and you drop the bar down every time you click diamonds that can't be cleared. Fill it to he top and you will earn a free diamond bomb which clears two entire lines off the board and earns you almost 15k points. The more of these you earn per match, and use, the easier it is to rack up massive points.
To get the highest number of points possible, you should aim to clear off the biggest possible combination of diamonds at one time. Aim for the largest section of diamonds of the same color. For example, if you get only 3 diamonds, you earn a measly 100 points, whereas a block of 4 diamonds will give you 400 points. Points can run into the thousands when you clear more than six diamonds.
The bigger your combo of cleared diamond blocks, the faster the bar at the top of the screen begins to fill. This will eventually reward your with a diamond bomb that clears two rows of diamonds, as well as well over 10,000 points per use.
Make sure you try to avoid clearing blocks of two or less diamonds, as this drains your meter.
The gold bars which you may have noticed can be used to purchase new lives. You need 7 for an life refill.
