It's a kind of rare amethyst.
Siberian amethyst is found in the Ural Mountains, with deposits outside the town of Mursinsk near the city of Ekaterinburg. Amethyst has been mined in this area since at least the 18th century and probably earlier.
http://www.thefrenchblue.com/rww_blog/2010/09/02/siberian-am...
El tono más apreciado es el violeta intenso con destellos rojos y de brillo aterciopelado, esta calidad excepcional, se denomina amatista siberiana.
http://amaraslasjoyas.blogspot.com.es/2011/03/amatista-la-pi...


--------------------------------------------------
Note added at 28 mins (2016-12-19 18:31:21 GMT)
--------------------------------------------------

Siberian amethyst or emerald.
I have also found references to "esmeralda siberiana". Without more information it's hard to say if the gem is an amethyst or an emerald.

--------------------------------------------------
Note added at 3 hrs (2016-12-19 21:47:37 GMT)
--------------------------------------------------

Amethyst seems more likely.

Los colores profundos son los más valiosos, en particular, un púrpura cálido con destellos rosados. La "Siberiana", púrpura intenso con destellos rojo y azul, domina los precios más altos.

http://www.gemselect.com/spanish/gem-info/amethyst/amethyst-...