"Glassy/hi-fi" isn't really a tonal quality that's introduced by a compressor. Some compressors, typically cheaper ones, may have a built-in high frequency "enhancer" which I guess can sound "glassy", but usually not in a nice way. Harsh/artificial sounding would be a better way of describing most such "enhancers".
In my experience the best you can hope for when it comes to "hi-fi" from a compressor is "transparent". I suspect the glassy/hi-fi tone you liked so much came from the amp/cab as a whole, rather than the compressor circuit.
Your best option is probably to find a glassy/hi-fi sounding amp+cab, and combine it with a good quality, fast/precise, transparent compressor. You may also want to consider a multiband compressor, for even more transparent compression.
This means you can probably rule out all compressors with tubes (or tube sims), all opto-compressors, almost anything "based on" classic, vintage studio compressors and anything marketed as warm/vintage sounding.
This will of course rule out a lot of Talkbass-favorites...
I'm usually more into colored/vintage-style compression, so I'm probably not the right person to give advice on transparent/precise comps. But if had a glassy/hifi bass tone that I wanted to STAY glassy/hifi after compression I would probably go with something like the Boss BC-1X. This is a very articulate and relatively neutral sounding compressor pedal, although maybe leaning slightly towards "bright" rather than 100% transparent. It's not my personal favourite, but I think it could be a good one for your specific needs. The "glassy/hi-fi" tone will have to come from somewhere else though, the compressor won't do that.
As for the Diamond, I've never owned one, only tested one briefly. Based on that short test (with a bass/rig that wasn't my own) I got the impression that the Diamond was leaning slightly towards "fat" rather than "transparent/hi-fi", but that it wasn't OVERLY colored either. Certainly not dark/muddy. Others will have FAR more experience with the Diamond that me, but I'm pretty sure it won't give you "glassy" unless your bass+rig provides the glassy part.
Also, remember that no compression is better than poor compression. It's very easy to competely ruin your dynamics with compression. If you don't have much experience with how a compressor actually works, you will probably get the best results with a simple bass-specific "one-knob" compressor, rather that a compressor with individual knobs for attack, sustain, ratio, threshold, etc.