Lab grown gemstones also belong to synthetic gemstones. They are man-made material with essentially the same chemical composition, crystal structure and optical and physical properties as the natural gem material. Why do we list a single column separately? Because these 4 lab grown gemstones correspond with 4 precious gemstones diamond/ruby/blue sapphire/Emerald.

Lab grown diamond/HPHT/CVD=Diamond
Lab grown ruby=Ruby
Lab grown blue sapphire=Blue sapphire
Hydrothermal Emerald=Emerald.

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