Fine Cut = Precision cut or visually imitates a precision cut. These stones have equal and symmetrical faceting with proper cutting angles ("critical angle') and depth. AAA = eye clean, any inclusions will not be visible to the eye. Weight is approximate. Depth is between 60% and 70% of size listed. Size can vary +-0.1mm. 2-3mm (millimeter) gems are very small - less than 1/8 inch. Optima Gem is a US based small business that has provided honest, accurately graded gemstones for over 25 years. Satisfaction Guaranteed. Gem Species: CORUNDUM Hardness: 9 Density: 3.95 RI: 1.76

We carefully select the rough to represent accurately its natural counterpart. These gems are created by the Flame Fusion and have essentially the same physical properties as natural Ruby.