As an example, I just threw this together using Photoshop...only took a few min so its not spectacular but its an idea of what I'd prefer to see. Using an existing emblem, I added a thicker beveled border, embossed the white background of the crest a little to make it stand out, and for the diamonds; I darkened the color and added some contour to give them depth.

FFXIV Linkshell Emblem Comparison