The gate derives its name from the beautiful glazed tiles used to decorate its outer arch. These tiles are the earliest examples of this technique which was later refined in Lahore. These tiles are blue in color.

An inscription on the left side of the gate gives the date of construction of the fort. the inscription is in Persian and is translated as follows

In the Hijri Year 948 came the exalted
At that time constructed the great fort
The emperor is Sher, with long life
There is no match to his good fortune
It was completed by Shahu Sultan
 

The Hijri year 948 is 1541 AD.