No you can not get one
Yes, a raw diamond will always test as a diamond.
Type hidden test at the start of the game and then just click and drag the ball.
It makes your game not work
i have hear is only 1 way, but i havent test it personal. when you go to wifi center on jubilfe city, get in and put 1 Pokemon for trade. for example put chimchar and ask mew. now, the trick is, when you w8 to accept the Pokemon, ther is acloack on your chat that is moving(i think is saving) close the game, after he have done 6 circle and half, and before 8 circles. i havent test cause i cant get on wifi, so if it work, plz inform me:p
Take your diamond to a jeweler who can test the stone to confirm that it is or is not a diamond.
you take a test about your personality and the game matches you up with the Pokemon most like you. you get to choose a partner that isn't your type
You just don't test it!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!
check for hidden blood
first you need a underground kit from eterna city and do some kind of tests until you get to the test where you can make your secret base.
The field test for diamond is 'extreme hardness'.
hidden test or hidden ball
One way to test a diamond at home is to use the fog test. Breathe on the diamond like you would on a mirror - if the fog dissipates quickly, the diamond is likely real. You can also try the newspaper test, where you place the diamond face down on a newspaper - if you can't read the print through the diamond, it may be real. For more accurate results, consider taking your diamond to a professional jeweler for testing.