Group 1 - The price of gold in Japan has reached a historical high of 17,678 yen per gram (approximately 830 RMB), marking a threefold increase compared to ten years ago [2] - The area of Toi in West Izu, known for its hot springs and beaches, has a historical significance as Japan's largest gold mine, producing around 40 tons of gold since the Edo period [4] - A notable exhibit in Toi is the world's largest gold bar, certified by Guinness in 2006, originally weighing 200 kg and later re-cast to 250 kg after being surpassed by Taiwan [6] Group 2 - The value of the 250 kg gold bar has surged from 400 million yen (approximately 18.8 million RMB) in 2005 to 4.4 billion yen (approximately 207 million RMB), an increase of 11 times [7] - The exhibit of the gold bar will end on July 31 due to rising management costs, including insurance and labor, making maintenance increasingly difficult [8] - Japan has seen a rise in gold thefts, including a case involving a former employee of Mitsubishi UFJ Bank who stole gold worth 280 million yen (approximately 13.16 million RMB) [10]