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"Our research consistently shows that people see synthetic diamonds as a different product category from natural diamonds, just as they see synthetic rubies, emeralds and sapphires as different product categories from their natural counterparts," the company told Xinhua in a statement.

"Beyond the traditional megacities along the coast, third- and fourth-tier cities in central China are rising in economic importance and should be on the radar of China-focused businesses," said Wang Dan, a China analyst at the EIU.

"If we look at the arrival numbers for 2018, we can see that some Eastern and Southeastern EU countries including Czech Republic, Slovenia and Croatia saw substantial increases in arrival numbers, as also did the Southwest of the EU with Spain and Portugal," said Arlt.

This targets only the interference of external forces and the very small number of "Taiwan independence" separatists and their activities, he added.

If researchers are able to maintain entanglement over long distances, an "hack-proof" messaging encryption system could evolve, according to Pan's study published in the journal Science in June of 2017.