I agree with [USER=69670]@IamSam[/USER] and [USER=126614]@polarwoc[/USER]
You have a great attitude and forum members are more than willing to help.
I will second IamSam's comments about many ways of getting things done and just choosing the one that appears easiest given the situation. Here is an similar approach yet one that creates the transparency without a selection. With your time crunch with your business and to minimze learning curve, IamSam's approach would be the way to go. When you have time to learn more, and have more Photoshop tools in your toolbox from which to choose, you could consider the approach given below.
First Start with the Layer Stack as IamSam indicated with a Clipping Mask with the Mother of Pearl image on top. Turn off the visibility of that image and add a blank Layer at the bottom of the stack as shown below:
[ATTACH=full]113085[/ATTACH]
The double click on the right side of the Layer Panel to open Layer Styles and slide the top Blend If slider to the right until the black disappears to transparency and you have a good crisp boundary around the cloverleaf. That was around 100 yet is fun to play with the slider to see what happens:
[ATTACH=full]113086[/ATTACH]
Close Layer Styles (the Layer Panel will show a symbol that shows you have a Layer Style applied, and then right click on the right side of this Layer in the Layer Panel and choose turning this image into a Smart Object. The Thumbnail in the Layer Panel will change to show a small symbol showing it that is a Smart Object:
[ATTACH=full]113087[/ATTACH]
For the next step, I just turned on the visibility of the mother of pearl Layer deleted the Transparency Layer 1 (that last step is optional yet with the transparency incorporated into the Smart Object Layer 1 is not longer needed. Your end up with the result you desire and you just need to save in a format (e.g. PNG) to save the image with the transparency intact:
[ATTACH=full]113088[/ATTACH]
Done
Hope this is of some help when you have more time to go up the Photoshop learning curve.
John Wheeler