More than two-thirds of all curling stones originate from this tiny volcanic pug.
The other being the Trefor Granite Quarry in Wales.
The goal is to place the teams stones closer to the target than the opponent team.
The granite blocks used to play the game cannot be manufactured from just any granite.
Ordinary granite would crack, but not the key in quarried from Ailsa Craig.
Ailsa Craig produces two types of granite for curling Blue Hone and Common Green.
A curling stone made from Ailsa Craig granite has an average lifespan of 20 to 30 years.
There are stones in use today that were quarried 40 to 50 years ago.
But every few years the company is allowed to return to the island to collect stones.
The last harvest of Ailsa Craig granite took place in 2013, after a hiatus of 11 years.
Today, most curling stones are hybrids, made from both Ailsa Craig granite and Trefor granites.
