This price is not ridiculously low. Maybe the brand of diamond is not loud enough in your place, so sometimes the price of activities is lower. Diamond is also a well-known brand in the jewelry industry, and it is also a quite old brand. The purity of gold is similar. No one can guarantee in writing that their gold is purer than others', but the country has standards. If you buy thousands of gold, the content inside must be at least 999.6, and the gold content is not less than 999, which is called thousands of gold.
What enthusiastic netizens downstairs said is also very reasonable.