Granite Types

Please take a moment to go through our Granite Types section to learn more about the various granites used in the manufacturing of curling stones.

Curling stones are a curling club’s biggest asset, so it is important for clubs to have a long-term plan for the health of their stones. Knowing what type of granite your stones are made from will give you the information you need to make informed decisions on the future of your stones.

Blue / Gray Trefor

Usually deep blue/gray in colour, this type of Trefor granite has small prominent white flecks that can be easily spotted throughout the stone. As part of the Trefor granite family, this type of granite is also excellent material for strikebands.
It is essential for curling clubs with Trefor granite stones to keep an eye on their strikebands and have them reprofiled approximately every 25 years.

Red / Brown Trefor

Red / brown Trefor Granite can be found in several shades of brown, and will always have small white and black flecks that run throughout the stone.
Red/brown Trefor granite is suitable for both reconditioning and inserting, although inserting is our recommended option as it brings the best of running surface material together with the best granite for strikebands.

Blue Hone Granite

This type of granite can be characterized by its colour, and in most cases the condition of the strikebands. Light gray with random white specks throughout the stone, blue hone granite stones predominantly have half moon shaped chips within its strikeband. Blue Hone granite is a very densely grained granite. Used in inserting stones, Blue Hone granite is the optimum material for repairing the running surfaces of pitted stones. If a curling club has Blue Hone granite stones, these stones can be reconditioned providing that the strikebands are in good condition.
The same density that makes Blue Hone granite a great material for inserting also makes it undesirable when it comes to strikebands. Once Blue Hone granite stones have begun to chip, it is virtually irreparable. The chips are too deep resulting in a large amount of material that will need to be removed in order to get below the chips and return the stone to its proper convex shape. If your club’s stones are made of Blue Hone granite and the strikebands are beyond repair, contact our office and ask about trading them in towards a set of brand new Trefor granite curling stones.

Ailsa Craig Common Green Granite

Green in colour, Ailsa Craig Common Green granite stones have large black deposits in the stone that are outlined with white flecks. Common Green granite has a make up that includes dissolvable material making this type of granite very susceptible to pitting. The strikebands of an Ailsa Craig Common Green granite stones is very much like that of the Blue Hone granite stones, and it is not uncommon to find half moon shaped chips in the strikeband area. Taking into consideration the quality of the strikebands and the chance of pitting, reconditioning this type of granite stones is not the best choice for a curling club with Ailsa Craig Common Green granite stones.
Inserting is a possible repair solution, however the decision to do so should strongly take into consideration the quality of the strikebands namely the number and depth of chips in the strikeband area. Ailsa Craig Common Green granite has been reintroduced in new stones in recent years, but the amount of impurities in much of this newly gathered Ailsa Craig Common Green granite will develop pot holes in the strikeband area that will rapidly increase in size with frequent use, resulting in a much shorter life span for stones made from this new Ailsa Craig Common Green Granite.


This granite is pinkish to brown in colour and has very large white and smaller black flecks throughout. Keanie is a very porous granite, and it is this characteristic that make Keanie granite stones high risk for pitting and developing flat spots in the strikeband area. A flat spot in the strikeband area result from crushed granite and once that occurs the damage is irreparable.
If a curling club has stones made from this granite serious consideration should be paid to replace their stones. Contact our office to find out how you can trade your Keanie stones in for a set new Trefor granite stones or a set of remanufactured granite stones.