1. The main feature of opal is that it can see a clear brown cat's eye. The spun silk inclusions of opal are rutile and hollow tube. Because these tubular inclusions are slender and dense, the cat's eye effect is particularly obvious even under weak light source.

2. Artificial opal is made of glass fiber, which is red, blue and brownish yellow, and some brownish yellow varieties are very similar to natural opal. The difference between the two is that artificial opal has 2-3 bright bands at the arc top, while natural opal has only one; Observing the two sides of artificial opal with a magnifying glass, we can see the hexagonal honeycomb structure; Meanwhile, the hardness of artificial opal is lower than that of natural opal.

3. Illuminating from the side of the opal with a single light source, the colors on both sides of the opal are different. When the honey yellow opal is illuminated from the left, it is honey yellow on the left and milky white on the right. When illuminated from the right, its color is just the opposite.

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People's Daily Online, Taipei, March 30th, 20 1 1 (Reporter Chen Xiaoxing, Suning) The reporter learned from the inaugural meeting of the 30th annual tourism conference held here today that Hualien Guanglong Jade Store was complained by mainland tourists for selling "opal" with a market value of about 1000 yuan (NTD, the same below). Wang, head of the shopping evaluation group of the Quality Assurance Association, said in an interview with this reporter that mainland tourists must ask for and keep the quality guarantee and receipt when buying high-end goods in order to protect their rights.

Recently, cross-strait media reported that a mainland tourist spent 450,000 yuan to buy an "opal" with a price tag of over one million in Hualien Guanglong Jade Store. After the buyer went back to the mainland for identification, he learned that it was only nephrite from Taiwan Province Province, which had a cat's eye effect. Although businessmen in Taiwan Province claimed that there were differences in the recognition of gems between the two sides, the media in Taiwan Province reported that the market value of Hualien nephrite Opal with good quality was only 50,000 yuan. The market value of nephrite Opal bought by mainland tourists for 450,000 yuan in Taipei is only about 1 10,000 yuan.

Chen Yiquan, secretary-general of the Quality Assurance Association, stressed that in order to avoid the recurrence of similar incidents and implement the "one-price policy", spot checks will be strengthened in the future. If there is any violation, it will be punished according to the violation, and the most serious punishment is to cancel the qualification to purchase insurance. Taiwan Tourism Bureau affirmed the punishment case of Guanglong Jade Store by Quality Assurance Association, and suggested that shopping stores should not be too short-sighted and treat Luke as a fat sheep, which would be detrimental to long-term interests. It is reported that the Hualien District Inspection Office has investigated the case on suspicion of fraud.

Baidu encyclopedia-opal

People's Network-Keng Luke 450,000 to buy Opal? Taihualian jade shop banned.