i understand you don't want to make a ruby gem. however, you need to look at one in order to understand what you want to make. A ruby is a smooth stone.
This image is made of the color you want to use:

Lets look at the "glare" below, do you see how there are smaller shapes of lighter color? thats one component

and the second component is the gradiants, see below:

those two compoments when put together, give you the look you are talking about.
You have two choices. draw what you want and using the pen tool draw light shades of the same color, like in the first component; and last, draw shapes and apply gradients like in the second component.
Or
Find a texture of glass, make it to a black and white .tiff, use the opacity panel and do a mask. Find a texture that has lots of little shapes and repeat.
I would go with the first option, smaller file size. Easier way.
hope this answer your question?
thanks
jonathan