A glass which contains ultra-thin layers of aluminum, chromium, silicon, zirconium or the metal alloy titanium. The colors are almost holographic in appearance. Metallic oxides are bonded to the glass using an electron bombarder inside a vacuum chamber under strict laboratory conditions. Once the coating has adhered to the glass, it is fired in a kiln to make it permanent. The angle of the glass within the vacuum chamber determines the color. In actuality, there is no color produced. What you are seeing is pure light manipulation at it's finest.The appearance will be different depending on whether the light is reflected or transmitted.
As requested by Doggy, here's a pic of the only Dichroic Bracelet I've ever made. I've never put this one up for sale, since I thought it was lovely and I might not make another. But time has come to get back to the kiln.
It's comprised of eleven dichroic cabachons (about the size of a woman's pinky print) on a .925 silver bracelet. Brand new, never worn...only admired from afar and going for half-price at $75.

Thank you all for your kind words. You'll never know how much you've inspired and motivated me. I actually WANT to get back to my big, hot kiln. This hasn't happened in a long time. I've associated it with a difficult time in my life. No need to avoid the kiln any longer. It's not the kiln's fault. And it does bring me such joy. I love working with glass!
I'll put up pics of the remainder of my inventory soon in case anyone is interested in getting their holiday shopping done without leaving their easy chair.
