How to get this simple "embossed" effect?

[MarieMeyer]

I'd like to take a "fleuron" (a printer's "squiggle") from a type family and give it a subtle 3D/embossed effect. This is a screenshot of the outcome I have in mind.

Obviously, the key is a light stroke here and there on the top side, and a dark stroke here and there on the bottom side.

Can anyone tell me how to do that?

[Monika Gause]

Apply two more fills to the object via the appearance panel.

One of them in a lighter color, the other one in a darker color.

Apply the transform effect to each of those files. Move one fill to the top left and the other oe to the bottom right using its transform effect.

[Ray Yorkshire]

Maybe follow this tutorial

How to Create the Bevel & Emboss effects for editable text in Adobe Illustrator - Astute Graphics