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"The quality of Chinese synthetic diamond production appears to be advancing quite rapidly from what I am seeing. I have seen some Chinese product that rivals that of Lightbox," Zimnisky said.

But companies in China and elsewhere have mastered the technologies to manufacture them en masse in a matter of weeks or days, with the products practically indistinguishable from those mined from earth.

Tourism in the Greater Bay Area has huge potential, as cities in the area can work with one another to develop multi-destination travel with cross-border infrastructure, according to Anthony Lau, the executive director of the Hong Kong Tourism Board.

Despite the substantial progress that has been made, more needs to be done to stop the current decline in biodiversity, he said.