I mean, they are a true vivid green, not a pale or cloudy stone you mostly see at this price point.
Mined in Zambia, they are “clarity enhanced.” Almost all emeralds are clarity enhanced; it is not a stone that is clear when mined. Oils, waxes, and resins are common treatments. Sometimes they are also dyed (or the wax/oil is not clear when they use it, so it’s considered dyed).
It doesn’t say what, exactly, the treatment is on the website.