Is it possible to use transparency in an iPhone app icon?

I created a 57×57 circular icon (without shine) which has transparency outside of the circle for my app. I can successfully install the app on Simulator and iPhone. It works fine, and looks great.

However, can I submit an icon with transparency to Apple? Will they accept it? I can't find any apps which have transparency in their icon. Instead, they use a kind of pseudo-transparency - a jet black background with no shine.

How do you make an icon transparent?

Start by opening the icon in the Icon Editor by clicking on the Edit icon button. Select the element that you want to make transparent. Then, click the colour picker and click on the little box with a red cross. Click OK.

Apple may have updated the interface guidelines since this question was asked, but transparency is now expressly not allowed. See more here:
https://developer.apple.com/ios/human-interface-guidelines/icons-and-images/app-icon/