Here is a technique for proper embossed test. At this step, you have two options.
1. Select both components, export as a stl, let SW do its boolean magic on it.
2. For extra practice in Sketchup, select both components, make a component,, under Tools select Outer shell. This performs a boolean union.
With your model, make each letter a component, move, rotate where the bottom face is flush with the top part of the cross pendant. When your satisfied, select all letter components, make them 1 component.Hide the pendant component, move the font component down to where both volumes intersect.
When you created the 3D font, you can set extrusion measurements. If you want it to have an extrusion length of 2mm, give it a length of 3 mm. in the next to last step, when you move the test component down, set distance at 1 mm.