the yellow color is from the red glass being lit up from the inside

This puzzles me. On this photos I cannot se a light source anywhere outside the bead, but .... se above. Liebe Grüße

Thanks Thomas. Here is how I do it. I set the bead on a concave mirror, there are a couple of reasons I use a concave surface, you'll see right away if you try this at home!
I use black velvet and black plexiglass sheet scraps as background.
I then light the bead from behind with a fiber optic cable and with a little light from above, viola, a picture! I crop everything unwanted and what's left over is a finished photo. Oh and my hobby is Bead collecting not photography, LOL.

.....this shot shows how the unwanted areas around the bead and reflection are masked with a black.....next we resize

too many people post photos of huge backgrounds and little beads, here is what the last shot looks like when the unwanted background is removed completely, now when you resize the photo it is the bead that gets all the attention and not the background.......this shot is still unfinished, I would still play to clean up the edges where I cropped the bead from the original background. Gruss, Thomas

It is still a little difficult for me to understand all these lightening tricks as I cannot even do some proper macro shots, not to talk about sophisticated bead pictures, but I am learning.

pointing out that your hobby is NOT photography! Who would have sought that?????
Danke und liebe Grüsse

I'm always experimenting with lights, this is a piece of plexiglass, it seems that light transmits real nice through it, I'm still playing with how I can use this in lighting beads????

sometimes it looks like an operating table at an emergency clinic!

every now and then I luck out and the ambient room light is perfect for a particular shot....this has not been edited just resized!

here I placed some transluscent red Kiffa beads in an off white cardboard box, I poked a hole through the bottom of the box and held a flashlight against the hole.....this is still in the experimental stage.

I'm not a proffesional photographer and I use what I have available, here I use the surface of an old light table from my illustrating days as the table. normal lights....

basic table top lighting you can get at Home Depot

some great earthy colors, these I picked because the perforations were huge!

some Constantini and others???

note the milli cane in the layer of the reddish one...