So, when I was younger, I used to collect these National Geographic Kids Almanacs for each year, and they would always have this one page related to birthstones. This is from the 2012 version.
Mika's birthday month is May, so his birthstone is the emerald. That's the same color as Yuu's eyes.
What's even more interesting is the fact that it symbolizes "Pure Love." Strangely fitting, huh?
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Bonus: Yuu's birthstone
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All About Yuumikayuu: A Book of Analyses
RandomThese are mostly my observations and interpretations of scenes that may suggest romantic implications between Yuu and Mika. (I also enjoy writing analyses or random commentary outside of the ship, so when that happens, you'll find a * symbol in the...