Water Mark on Absolute Black Granite

   We installed an absolute black granite countertop a few weeks ago. A guest put a glass with some water and ice cubes on the countertop and I left it there overnight, thinking it would do noo harm. In the morning when I removed the glass it left a circular watermark on the granite, the exact size of the glass. This was probably caused by condensation because the glass was dry before it was put on the countertop. I cannot remove the water mark (stain) and am afraid to do anything without professional advice.