What is the black inclusion present in an emerald gemstone?

Most natural gemstones have inclusion including emeralds. The can range in colour, size, position and types and can also be a useful tools for gemologist to determine the type of stone they are dealing with or the origin. read more

Figure 7. Top: Rectangular multiphase inclusions were visible in emeralds from Kafubu. Bottom: Detail of rectangular multiphase inclusions in an emerald from the Kagem mine reveals relatively large gas bubbles, with and without solid inclusions. Photomicrographs by V. Pardieu, brightfield illumination. Image widths 2.7 mm (top) and 1.1 mm (bottom). read more

Emerald is the most precious stone in the beryl group. Emeralds without inclusions are considered as rare and highly suspicious. Afghanistan/Pakistan have 2-3 phase inclusions which is called as black inclusions. Three-phase liquid-solid-vapor inclusions are very familiar to gemologists as typical for Colombian emeralds. read more

Along with the inclusions being discussed below, the following are examples of what one can expect to see in an emerald: Veils – these are small bubble-like inclusions which form a layer which can vary in width and length. read more