I did a trip to Venice and I couldn't resist to buy one of those fish glass balls from a souvenir shop. You get them in different sizes, also in different qualities. Most have one fish inside, other ones you find with two fishes or more:
I basically like the Murano glass arts, but I was curious how the fish ball would look like when it is faceted: I chose a rather cheap one with a diameter of about 3 cm to be my faceting victim. Upfront I did some trial rendering of a faceted fish glass ball:
Here's a short video describing step by step what I did. Further down you can see the simple faceted glass fish ball.
You may have noticed that in the faceted version the blueish bottom of the ball seems to have nearly completed disappeared. During faceting I figured out that the blue colored glass is just a thin layer on the surface that quickly gets grinded away. So for next time I'd rather try to not facet the bottom at all to keep the nice blue color.
I did the faceting similar to quartz, although I faced problems to polish the large facets on thin-lead with diamond. So in this case I decided for a compromise between sharp edges and a good polish by utilizing a window cleaning rag sticked on a aluminium lap with ceroxide powder. The polishing was really quick and easy and at the end the edges are not that heavily rounded.