The price of bluestone primarily includes the following aspects:

1. Dimensions: The size specifications of bluestone tiles directly impact their price. Generally, larger dimensions may result in higher prices. For instance, a bluestone tile with dimensions of 300mm x 600mm might cost between 85-115 yuan per piece, but the final price depends on other factors as well.

2. Origin: Prices of slate from different origins may vary. Origin factors are typically related to the cost of mining, transportation, and the quality of raw materials.

3. Quality Grade: The quality grade of bluestone is also a significant factor in determining the price. Wear-resistant stone offers better durability, stability, and aesthetics, which may result in a higher price.

4. The processing technique of bluestone can also affect its price. For instance, hand-carved stone tends to be more expensive than machine-processed stone due to the higher skill and cost required for hand carving.

5. Market Demand: Changes in market demand can also affect the price of bluestone. Prices may rise during periods of high demand and fall during periods of low demand.