The red gem ring bought at Royal Jewelry Center in Huang Huang, Thailand weighs 0.40 carats, the diamond value is 0.03 carats, and the price is 5400 RMB. Whether it is true or not, whether it is expensive or not, needs to be measured from several aspects.

First of all, ruby is a rare gem, and its quality and value mainly depend on its color, purity, weight, cutting and historical background. When buying rubies, you must choose a regular jeweler and make sure that they have relevant certificates and guarantees.

Secondly, for the price of red gem ring, besides the value of ruby itself, we need to consider the process, design, metal material and accessories of the ring. When buying, you can consult the jeweler for relevant price information and make a judgment by comparing the market price.

Finally, for tourist souvenirs, their value is often not reflected in the price, but in the significance and commemorative value. If the red gem ring you buy conforms to your own aesthetics, it will be memorable, even if the price is slightly higher.

In short, you must be cautious when buying valuables such as jewelry, choose formal channels and reputable businesses, and know relevant knowledge before buying to avoid losses.