For one, it's... understandably... on the expensive side. Most of it is found in Afghanistan in old Roman bottle dumps. It has a finite source and once the dumps run dry, that's it!
Another thing that is less than ideal is that even though the glass has survived for thousands of years beneath sand and stone, it's on the more fragile side. Not only is it prone to chipping and breaking, but the delicate finish on top can be worn away with body oils or flake off.
So I set about creating a similar effect in polymer clay. I'm still experimenting with other mediums, but that's another blog post for another day. After several different attempts, I think I've figured it out and came up with a method that I'm pleased with.
Here are my results:
This is one version of my Faux Roman Glass. I really like it! I even added larger holes in this batch to replicate the look of authentic pieces even more.