It is easy to comapre to Gaffer Chalcedony and Blue Chalcedony as it is also a striking glass that turns rainbow colors. Striking means that the colors change depending on the length of time in the flame. It is different than Chalcedony, but just as cool to use. See a picture with both colors below.
What I really like about this color is that it is very easy to strike and it gets a lot of blues and purples (purple being my favorite color). Seen here on Olive. Listed on Etsy here.
As you can see in this photo of a bead with Chalcedony in the center and Multicolor Dark on the ends, the Mulicolor does not get the crackling (where it looks broken up). I like this crackling and it is one of my favorite things about Chalcedony, but sometimes you don't want that.
This color turns green and then turquoise the more you work with it. These beads were worked a long time and the second one worked very hot for a long time and it is quite turquoise. I was surprised and pleased with the color. Both of these have Iris Orange (aka Raku) stringer designs.