About Stone

Alliance Minerals Quality Standards

For years, Alliance Minerals has established its own quality standards and consistently applied these standards to every production step in order to supply the highest quality natural stone products to our customers.

Based on the different colors of stone, Alliance Minerals classifies its product quality in 4 grades:

Prime:

  • Prime slabs measure a minimum 270cm in length and 160 cm in height.
  • Free from natural material defects – cracks, patches, bands, colors, and pattern variations.
  • Process defects  – thickness variation, flatness, and gloss value are within the acceptable tolerance value.

Prime mini:

  • Prime mini slabs measure a minimum  240cm in length and 130cm in height.
  • Free from common natural material defects as mentioned above in Prime grade products.
  • Process defects  – thickness variation, flatness, and gloss value are within the acceptable tolerance value.

Classic:

  • Classic slabs measure a minimum 250cm in length and 130cm on height.
  • Material defects vary color to color. Detailed permissible and not permissible defect descriptions are listed here.
  • Process defects  – thickness variation, flatness, and gloss value are within the acceptable tolerance value.

Commercial:

  • Slabs not falling in the above three categories – Prime, Prime mini & Classic grades will be classified as Commercial.
  • Sizes of the commercial slabs vary depending on the nature of defects.

Alliance Minerals classifies its quality standards based on different stone color categories. This is because different colors of stone have different natural color/pattern varieties and require different quality gradation standards.