Jewel・Popular Kanji・Seasons・Spring “Ryokugyoku” – Japanese Kanji for Emerald 投稿者: japanese-kanjisymbols 投稿日: 2011/05/022011/05/02 I wrote “Ryokugyoku“. It’s Japanese kanji symbols for “Emerald”. It’s one of the birthstones of May. “Ryoku” means Green “Gyoku” means Jewel As for the stone words, Good luck, Happiness, Hope, Stability. What jewel Do you like? Please let me know your favorite words about a jewel.