First of all, it needs to be clear whether the brand "Mao Di International Jewelry" exists and whether there are official channels to sell 30 yuan's jewelry. If the brand has never heard of it, or the price of the official channel is much higher than that of 30 yuan, then it can be judged that the news is false.
Secondly, it should be noted that a lot of information circulating on the Internet is fake news or rumors, which requires us to be cautious. In order to attract attention, some businesses obtain traffic and sales by publishing false information, which is immoral and illegal.
Finally, when buying jewelry, we should choose the brand of formal channels to ensure the quality and authenticity of the goods. Be vigilant when buying goods, and don't be deceived by false news.
In a word, the question of whether 30 yuan is real needs to be judged according to the specific situation. But we should always keep a clear head and not be confused by false news, so as not to be misled by unreliable information.