Why Winter Olympic Curling Stones Are So Expensive

The Making of Olympic Curling Stones: A Deep Dive into K Scotland & Elsa Craig Granite

Key Concepts:

• Elsa Craig Granite: The unique granite sourced exclusively from Elsa Craig Island, Scotland, considered the gold standard for Olympic curling stones.
• Blue Hone Granite: A specific type of granite from Elsa Craig used for the running surface insert of curling stones, providing optimal friction.
• Common Green Granite: The granite used for the body of the curling stone, providing weight and impact resistance.
• “Cheeses”: The term used by K Scotland for the initial cut blocks of granite ready for shaping.
• Cing: The process of cutting the granite slabs into the initial “cheese” shapes.
• World Curling Federation (WCF): The governing body that sets standards for curling stones, including size, weight, and material.
• Porosity: The measure of how much space exists within a material; high porosity in curling stones leads to water absorption and damage.

The Exclusive Source & Olympic Demand

K Scotland is the sole licensed manufacturer of curling stones for the International Olympic Committee (IOC). The company is preparing to supply 132 stones for the 2026 Winter Olympics, continuing a tradition established in 2006. A single Olympic-certified stone costs approximately $960, making a full set of 16 stones worth over $15,300. This high cost is directly linked to the exclusive sourcing of granite from Elsa Craig Island, Scotland. K Scotland holds the exclusive harvesting rights to the island’s granite until 2050. The granite’s unique properties are crucial for optimal curling performance.

Elsa Craig Granite: Composition & Properties

The granite from Elsa Craig Island is prized for its dense structure and minimal imperfections. It comprises two main types: blue hone granite and common green granite. Blue hone granite, identifiable by its white flecks (feldspars), is used for the running surface insert, providing the necessary friction for curling. Common green granite forms the main body of the stone, offering weight and resilience. The interlocking fine-grained crystals and feldspar within the granite contribute to its strength, preventing cracking or splintering even under the stress of cold temperatures and collisions. Unlike other rocks, Elsa Craig granite lacks significant veins or weaknesses that could lead to fracturing during gameplay.

The Harvesting Process: A Logistical Challenge

Harvesting granite from Elsa Craig Island is a complex logistical operation. The island is uninhabited and lacks basic infrastructure like water and electricity. K Scotland must transport all necessary equipment and supplies for the entire operation. In January 2025, the company harvested approximately 700 tons of common green granite and aims to acquire 1-2 tons of blue hone granite per harvest. The granite is initially extracted as large boulders, ranging from 5-7 tons, which are then processed into “cheeses” – the initial cut blocks. On average, one ton of granite yields around six “cheeses”.

Stone Production: From Slab to Finished Product

The process begins with cutting the harvested granite into slabs, approximately 145mm (14.5cm) thick, to achieve the ideal depth for “cing”. Not all granite is suitable; masons meticulously inspect each slab for imperfections that could affect performance. The best sections are marked for cing, the process of cutting the slabs into the “cheese” shapes. While the cing process is semi-automatic, the speed is manually controlled by skilled operators.

Following cing, masons chip away excess stone to prepare the “cheese” for shaping. The International Olympic Committee dictates the final size, shape, and weight of each stone (approximately 40 lbs plus 1 lb for the handle). The final stage involves polishing the stone to ensure uniformity in weight, size, and the running surface. The roughness of the running surface, achieved through the skilled hand of a mason, is critical for controlling the stone’s curl.

Historical Context & Market Fluctuations

Curling originated in Scotland but has become particularly popular in Canada, which boasts the most successful curling team historically. K Scotland’s history dates back to 1851, and the company experienced periods of both high demand and decline. Demand surged in the late 19th and early 20th centuries with Scottish immigrants bringing the game to Canada, leading to the construction of hundreds of curling rinks. However, demand dropped significantly after the 1950s when the initial surge in rink construction subsided, reducing the workforce from 25-30 people to 5-10.

The reintroduction of curling to the Winter Olympics in 1998 revitalized the industry. Mark Callen, former director at K Scotland, notes that the Olympics “opened curling up to the world,” increasing the number of participating countries from 25 in 1998 to almost triple that number 20 years later. The sport’s continued growth, with expanding markets in Asia (particularly China) and even remote locations like Antarctica and New Zealand, has driven up demand and prices.

Quality Control & Alternative Sources

K Scotland previously sourced granite from the Trevor Quarry in Wales but discontinued this practice due to quality control issues. The World Curling Federation (WCF) found that stones with a blue hone insert from Elsa Craig performed better, as stones without it were prone to pitting, porosity, and water absorption, leading to damage. The expansion of water upon freezing within the stone’s pores causes detrimental fracturing.

Sustainability & Byproduct Utilization

K Scotland harvests approximately 1,500 metric tons of common green granite and 300 metric tons of blue hone granite every decade. The company prioritizes utilizing all harvested material. Granite that doesn’t meet the stringent criteria for curling stones is repurposed into giftware, including three official Olympic products, demonstrating a commitment to minimizing waste.

Notable Quote:

“They’re very passionate about it because they know that this particular block of granite they’re working on that becomes a curling stone. Could be the stone that’s thrown for the gold medal at the Olympic Games. It could be the stone that decides a world championship.” – Mark Callen, former director at K Scotland.

Conclusion:

The production of Olympic curling stones is a highly specialized process deeply rooted in tradition, meticulous craftsmanship, and the unique geological properties of Elsa Craig granite. K Scotland’s exclusive access to this resource, combined with rigorous quality control and a growing global interest in curling, ensures its continued role as the premier supplier for the world’s most prestigious curling competitions. The company’s commitment to sustainability and byproduct utilization further solidifies its position as a leader in this niche industry.