石英股份：第三季度净利润为2831.32万元，下降49.48%

Group 1 - The core point of the article is that Quartz Co., Ltd. reported a decline in both revenue and net profit for the third quarter and the first three quarters of the year [1] Group 2 - For the third quarter, the company's revenue was 238 million yuan, a decrease of 8.43% [1] - The net profit for the third quarter was 28.31 million yuan, down 49.48% [1] - For the first three quarters, the total revenue was 753 million yuan, reflecting a decline of 24.46% [1] - The net profit for the first three quarters was 135 million yuan, which represents a decrease of 56.81% [1]