What should first-time visitors know about Luxury Jewelry in Dubai?

[hammadalshamsi]

A friend visiting the UAE asked me about Luxury Jewelry in Dubai, and I realized there are many factors that can be difficult for first-time visitors to compare, such as pricing transparency, hallmark standards, and after-sales support.

For those who have explored Dubai's jewelry districts, what information would you gather before visiting stores so the experience is more organized and less overwhelming?