Birthstone Picker for Mac

From Jon Brown Designs:

Birthstone Picker widget allows you to search by month and it will display your birthstone. It displays the stone of the current month or you can choose a stone from the back. You can also look at all the stones on the back of the widget. The tradition and origin of a special birthstone dedicated to each month, and that the stone of the month possessed a special virtue or cure that it could transmit to those born in that month, goes back to first century.