The phrase "emerald princess" can be rephrased in a variety of ways. Some options include "jade royalty," "verdant queen," "green goddess," or "nature's sovereign." Other phrases that encapsulate the regal and gemstone aspects of the term might include "jeweled highness," "gem-encrusted ruler," or "bejeweled sovereign." Alternatively, one could go for a more playful approach, perhaps using "emerald empress" or "princess of the green." Ultimately, the perfect synonym will depend on the context in which the term is being used and the desired tone. Regardless, any of these phrases is sure to evoke an image of beauty, power, and Royal majesty.