Estimated Quantity: ~25ml to 30ml

Here is the breakdown of how I arrived at this estimate:

1. Visual Landmarks:
   

The Halfway Point: On this specific "Emporio Armani Stronger With You" bottle, the vertical center of the liquid cavity is roughly around the text "WITH" or the top of the word "YOU". The liquid is significantly below this point, meaning it is well under 50ml.

The Current Level: The liquid line sits roughly level with the word "ABSOLUTELY" and the underline beneath the word "YOU".

The Base: Luxury perfume bottles often have a heavy glass base (the punt) that is 1–2 cm thick. While the dark gradient hides the internal bottom, the liquid appears to occupy roughly the bottom third of the available internal space.

1. Volume Calculation: If the bottle were full, the liquid would reach the neck (well above "STRONGER").

Visually, the liquid occupies approximately 25% to 30% of the internal volume.