I believe the blue, green and gold are wires wrapped around insulated wires.
The blue, green and gold are all ground. You can take these off by untwisting them.
The inner wires should be red, black and white.[br]
These go to common ground, audio left and audio right.[br]
Best would be to check the old jack to see the wiring.
This is assuming it is stereo. So the jack has 3 layers.[br]
If it has also a mic the it will be 4 layers.[br]
Google 3.5mm jack wiring diagram to find more information on this.[br]
Best to do this specific for your headset. [br]