The global market for competitive curling stones presents a fascinating case study in absolute market control. Unlike most B2B sectors where competition drives innovation and price discovery, the heart of this industry—the Olympic-grade curling stone—is governed by a near-total monopoly. This monopoly is not born of corporate strategy, but of geology and tradition. The island of Ailsa Craig, off the coast of Scotland, is the sole source of the two specific types of granite—Blue Hone and Ailsa Craig Common Green—that possess the unique combination of water resistance, durability, and consistent performance required for elite play [1]. For over 170 years, Kays of Scotland has held the exclusive rights to quarry this granite, crafting stones that are the official choice for every Winter Olympics since the sport's return to the Games in 1998 [2].
"There is no substitute for Ailsa Craig granite. Its properties are so unique that attempts to replicate them with other materials have consistently failed at the highest levels of competition."

