Historica:
Until 18 Century were made in the wake of the spread of commerce and the development of the arts repeated attempts to produce glass pens as an alternative to previously used goose feather.
Why is the glass Venetian glass pen nib is usually called, is unclear. While there are many sources on the development of the glass of Murano, near Venice in the spring in the 17 Century point, however, the similarity of the texts appear to contain the different sources that all point sources to each other. Its origin remains unclear. Nevertheless, one can observe that the term "Venetian glass pen is" has become a generic term and refers to writing instruments made of glass, regardless of whether they originate from Venice or not. (Source: wikipedia)

Slight variations in color, shape and size are possible, since it is entirely handmade.