Blue and Black Coral

[sroy_mcl]

I have collected blue coral & black coral beads also black coral skeleton piece is in my possession.It is my hobby to collect corals.A white piece is also with me. Can any friend reply me - whether these are treated as gem stone?
If so what is the use? ie. for which planet(s).

[touch_and_shine]

I would love to help. But I have
no idea. May b anyone else can help u.