1. Low brand awareness: The popularity of GSK sapphire in China is relatively low, which makes consumers know less about its products, so fewer people buy it, resulting in oversupply and lower prices.

2. Sales strategy: GSK sapphire may have adopted a low-price sales strategy to expand market share and attract consumers, so as to quickly enter the market or compete with competitors.

3. Low production cost: GSK sapphire may have a more efficient production process or a cheaper source of raw materials, which makes the production cost relatively low, so that products can be sold at a lower price.

It should be noted that the above are only possible reasons why GSK sapphire is cheap, and the specific reasons may vary with time, place and market conditions. If you are interested in the price of GSK sapphire, we suggest that you conduct detailed market research and comparison in order to make an informed purchase decision.