Its a bit northwest from dewford town.
The sapphire is on Six Island. You need a Pokemon to use cut on the dotted door of the cave.
you get the sapphire stone in the 6th island you have to open the cave somehow and you get a lugia if you go to the very bottom use cut on the cave
I believe it's in a cave on 7th island.
the ruby is in the cave on mt. ember on one island. the sapphire is in dotted hole on six island.
Desert ruins, Ancient tomb, Island cave.
You have to go to the Sevii islands and from there you must retrieve the Ruby and Sapphire for Celio, the Ruby is located on 1 island and the Sapphire is located on 5 island give the Ruby & Sapphire to Celio who is located in One Island. Once done Cerulean Cave will not be guarded.
Route 105 inside the island cave. you get him by walking in a circle around the cave touching every edge.
At the Anicent tomb, Sky pillar, Desert ruins, Island cave, Cave of origin.
you find the ruby in the cave right next to mount ember on island 1. to get the sapphire gem you have get the pass from celio to go to island 4567 and it is on island 6
You can find the sapphire in the dotted hole cave on six island to find the cave go to the southern portion of the island, use Cut on the door to open it then fall down the hole in the cave then fall down the holes in this sequence: up, left, right, down.
You need to know the move dive and get something from underwater
It says "stop and wait for time to pass twice"