Traits

One of three Gemstone genes, Ruby is comparable to the Amber gene in Norwegian Forest Cats, and appears as a drastic pelt change with age. Over time, the Ruby (erer) gene will begin to turn black pigment a ruby (red) color starting from the back and working its way down.

A Solid Black cat will turn Ruby but may retain black striping, as well as a black nose leather. A Black Tabby will turn into a Ruby Tabby, similar to a Red Tabby but richer. A Black/Red tortoiseshell will become Ruby /Red.  

This is a recessive gene, so a cat with (Eer) would be only a carrier of the gene.

See also: Amber and Sapphire.