Mohd Rahalim, F. , Jamaludin, J. and Raisin, S.N. 2023. NON-INVASIVE GRADING TECHNIQUE FOR RUBY GEMSTONE USING CHARGE-COUPLED DEVICE (CCD) . ASEAN Engineering Journal. 13, 1 (Feb. 2023), 69-74. DOI:https://doi.org/10.11113/aej.v13.18267.