1：Experimental Design and Method Selection:

The study employed CL, TEM, and EBSD to analyze the structural and optical properties of milky type IaB diamonds. CL was used for imaging luminescence features, TEM for high-resolution structural analysis and identification of dislocations and nano-inclusions, and EBSD for micro-texture and crystallographic orientation analysis.

2：Sample Selection and Data Sources:

Samples were collected from diamonds submitted to GIA's laboratory, including faceted and rough diamonds. Six samples were cut into plates for detailed study. All samples were typical milky type IaB diamonds with hazy or cloudy areas.

3：List of Experimental Equipment and Materials:

Equipment included a Zeiss EVO MA10 SEM with CL system, JEOL JEM-2100F and JEOL 2100F TEM instruments, JEOL JSM-7000F FE-SEM with EBSD detector, and a JOEL JEM-9310FIB FIB system for TEM foil preparation. Materials included diamond samples and cleaning agents (HCl and NaNO3 mixture).

4：Experimental Procedures and Operational Workflow:

Samples were cleaned and prepared as plates. CL imaging was performed using SEM with specific voltage and current settings. TEM foils were prepared via FIB milling and analyzed with TEM for bright-field, dark-field, and high-resolution imaging. EBSD analysis involved sample coating, orientation mapping, and data acquisition with specified parameters.

5：Data Analysis Methods:

Data analysis included FFT for diffraction patterns from HRTEM images, EBSD software (Channel 5.0) for orientation maps and pole figures, and interpretation of CL, TEM, and EBSD results to identify structural features responsible for milkiness.