Need help identifying a manga/manwa (School, supernatural, fighting, aikido, gem stones, diamond)
Hiseki Senki Stone Buster!



Unfortunately, I can not find an English summary online. If you read Chinese, Baidu Baike has a very brief synopsis. The manga was serialized in Shuukan Shounen Magazine.

In volume 1, the following events took place:


  Black shadows came out of the black stone, killed the store owner, and burned down the store.


See page 34. The store owner is saying: "My body is dissolving?"


  The black stone threw itself into his eye and fused with it.


See pages 47&ndash;48.


  He got another gift for the girl (a dolphin ring) and she happily accepted it.


See pages 101&ndash;102.

Later in the story:


   The guy with a jade necklace that can communicate with plants and the vampire with a ruby that manipulates gravity both appear in volume 3. The werewolf guy appears in volume 2. The monk with a blue stone that heals appears in volume 4.