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20. Queen Máxima Of The Netherlands
Much like how Prince Rainier III gave Grace Kelly an engagement ring with colors to honor his country of Monaco, as did King Willem-Alexander of the Netherlands with his ring for the now Queen Máxima (she is originally from Argentina). 

Máxima's ring features an oval orange diamond with two bullet-cut diamonds on either side on two diamond studded bands. It looks great with her yellow-orange shirt here, don't you think?