Vajra & Bell: Part II

Early vajra scepters represented in Indian, Swat and Kashmiri art prior to the 10th and 11th centuries are relatively plain and unadorned. They do not all have the pronounced five prong structure, embellishments and design work. By the 11th century, in Northern India and the Himalayan regions, the five pronged vajra design had become the standard shape which has continued down to the present time. The nine pronged has also followed this model. Although the shape has remained basically the same the amount of design and decorative embellishment has changed over time and regionally.

https://www.himalayanart.org/search/s...