Outstanding first grade quality specimen of Dioptase with striking gemmy crystals from the type locality of Altyn-Tyube deposit, Kazakhstan. The Dioptase crystals are up to 5mm, brilliantly lustrous with rich and saturated dark emerald-green color and very sharp, perfectly terminated crystals. The quality is superior. The crystals are gemmy with marvelous neon green nuances. In excellent condition – some outside edge contacts., Superb Dioptase specimen!