Saffron is the world's most expensive spice. Saffron, is the stigma or red flags of flower saffron, which are about 130 pieces of it weight 1 gr.
Currently saffron production and processing is completely made by hand and need lot of work force to available for market. and may be this is one of the reason that why saffron is so expensive.
The Price change with the quality and time of harvesting and season of sales.
Production season of saffron is autumn.