It is important to caulk properly between granite tile countertops. Improper caulking can cause several issues with your countertops.
Step 1 - Caulk Between the Tops
You will first need to seal the area between the granite tile tops with clear caulking. This will prevent moisture from penetrating the area underneath the tiles and causing the backing board to rot or warp and ruining your countertop. Cut a very small hole in the end of the caulking tube and use a firm, continuous motion to apply caulking into the open area. Do not fill to the top. Allow the caulking to set up for at least an hour before doing the next step.
Step 2 - Match the Tile
The granite chip powder will match the countertops and make the area look like one continuous top. It will give the area a more finished professional look. If you have a scrap of your countertop, take it with you when purchasing the powder kit.
Sprinkle the chip powder into the crevice where you applied caulking using manufacturer's instructions for the product you purchased. Allow it to set in the amount of time specified and clean up any leftover powder with rags and paint thinner.