Not all natural stone is created equal. A seemingly identical slab of granite or marble can vary dramatically in price—sometimes by hundreds of dollars per square foot—and the difference comes down to a systematic evaluation process that the stone industry calls block quality grading.
Block quality determines everything from the structural integrity of your countertop to whether that stunning white marble will develop unsightly cracks within a year. When quarry operators extract raw stone blocks, they immediately assess multiple factors: the uniformity of color and veining, the presence of natural fissures or weak planes, the …


