These new table lamps are made using Incalmo glass technique, which is a very specialised process that fuses two pieces of contrasting colours of glass together. It is highly skilled as the fabricator has to produce two halves with exactly the same diameter openings so that the two pieces of glass can be heated and joined.
Please note that as these pieces of glass are handblown, the colours and height may differ slightly from the website image due to the varying thickness of glass.