Let's start with the truth. 

Baltic amber in red color does not exist. 
Redish shades are called cognac and they are obtained when the amber is heated. And that color is only oxidative layer on the surface.

amber pendant

About red amber, we can say that some of the companies use vinyl dye (used for clothes).
In autoclaves, with pressure and heat help, amber absorbs the dye into itself. 

In this way, it is possible to make amber red, blue, green and any other color.
Our company never did and does not do this kind of tricks.

We are categorically against of any glue, lacquer, dye, plastic or any other chemical materials usage, in order to hide cracks of amber or change its color.

This amber brooch and drop earrings are natural color: 

amber brooch

amber earrings

And these round beads are amber or copal, which absorbed red and clue color vinyl dye:

vinyl red amber

vinyl blue amber

See the difference?