The video contain about the internal world (Inclusions) of different types trip during formation. Such rutile, tourmaline needles etc.
The below video is about the petroleum inclusions in quartz , from Baluchistan, Pakistan.
Glass (Lead) infilling
External: Open cavities (usually on pavilion), filled with glass for a better looking stone (seals cavities, adds weight). Internal: Traces of glassy residue in fractures after heating may be found as a by-product of the particular heating process used. (Stable).
Detection: Magnification. Differences in luster between glass infilling and stone plus possible bubbles in filling and blue orange flashes.Comparison of Emeralds from the Chitral District, Pakistan, with other Pakistani and Afghan Emeralds" by Hanser et al. (2023), suitabl...