Charles Heckel , Jul 04, 2009; 11:26 a.m.
Yup. Foreground color white, Brush menu, right-arrow for selections, choose Assorted Brushes from the sets at bottom, and Append. Choose the x-shaped 48-pixel brush. On a new layer click where you want your glint. Choose the x-shaped 25-pixel brush, click Brush Tip Shape, rotate it 45 degrees, and make it as big as you need. Click over your original x-shape on the new layer. Now choose a soft-edged round brush between the two sizes and add it. That's your glint, but you might want to jazz it up a bit.
Add a new layer and control-click the glint layer to select the glint. Select the Gradient tool, then the Gradient Picker, and pick the Spectrum gradient (the round one). Drag it out from the center of your glint to the edge. Now you've got refraction and diffraction going on.
Deselect the glint, make only the glint and gradient layers visible, and Merge Visible, then make your background layer visible again. Set blend mode and transparency to something that looks convincing--Lighten, if you've got a dark background to bling it against.
All this for one lousy glint, right? But if you've got your glint layer selected, ctl-J will make new layers, and you can put the glints on those wherever you want with the Move tool.