Mac – Macles
Twins after spinel law, fragments of twins, crystals and crystal fragments with twinning lines.
1q: 1st quality. Loupe clean, isometric, with even splits.
2q: 2nd quality. Minor defect. Growth-line. System of micro-inclusions located near twinning lines (also named as “web”). Split along with small crack. Loupe clean stones with uneven splits. Generally loupe clean diamond with small defect in a peripherical zone.
3q: 3rd quality. Marked structure, steps. Defects in a peripherical or intermediate zone. Loupe clean triple intergrowths. Intergrowth lines till a central part. Crack situated in one zone.