Final answer:
A whetstone (option 1) is the most recommended type of stone for sharpening shears due to its balanced abrasiveness and versatility in various grit sizes, suitable for different sharpening stages.
Step-by-step explanation:
The question relates to the suitable type of stone for sharpening shears. When it comes to sharpening shears, the most commonly recommended type is a whetstone. This is because a whetstone, typically made from natural or synthetic materials, provides a great balance of abrasive qualities that is adequate for sharpening the blades of shears without removing too much material. Additionally, whetstones come in various grit sizes, suitable for different stages of sharpening, from repairing or reshaping the edge to fine-tuning and polishing it.
While other types of sharpening stones like diamond stones, oilstones, and ceramic stones exist and can be used for various applications, whetstones are often preferred for shears. Diamond stones, known for their durability and cutting speed, might be too abrasive for shears, risking over-sharpening and damaging the blades. Oilstones, which require oil, are slower in sharpening but provide a fine edge, whereas ceramic stones provide a very fine edge but might not suit all sharpening phases or steel types.