In 1621, the Kellie pearl was found in the Ythan River and given to King James VI. This pearl was the largest freshwater pearl to ever be found in the United Kingdom and still holds that record today. Because of its rarity, King James VI decided to put this pearl on the Scottish Crown among other pearls, diamonds and rubies. The crown was used two times after the addition of the pearl for the coronation of Charles I and Charles II. The crown was then locked away with the Scottish Crown Jewels in the Edinburgh Castle for many years.

There is very little known about the characteristics of the Kellie Pearl however many assumptions are made. Because it is part of the Scottish crown, it is believed to be a near spherical shape in order to match the other pearls that are incorporated. It is also believed that this pearl is white because that is the most common color of freshwater pearls.
The crown has been used very few times since 1822 and was last seen in 2004 at the official opening for the new Scottish Parliament Building.