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lab grown同natural有唔同既growth pattern https://www.gia.edu/images/JS_SynDiamond_slide-20-468x467.jpg The DiamondView imaging system (top) enables GIA to view natural and synthetic diamond growth patterns. Concentric growth patterns (left) identify a stone as natural; cross-shaped patterns (center) identify a stone as HPHT synthetic; striations (right) identify a stone as CVD synthetic. Photos: Kevin Schumacher and Andy Shen/GIA.