You may get .psd* file of "Platinum Credit Card design" Photoshop tutorial by making a donation. Put the tutorial title in "Add special instructions to seller" line of PayPal and it will be sent to you shortly.
Add any logo or icon.
Ctrl + click on Layer1 to load selection.
Create a new layer.
Fill the selection with white color opacity 25%. Deselect.
Draw a contour using Pen Tool and Convert Point Tool. Click Ctrl + Enter.