There're 2 popular Lab grown Emerald Green Color Gemstones,One is Zambia Green, another is Colombia Green color.

How can you tell a Zambian emerald?
Emerald appearance is sometimes associated with its mine location. Colombian emeralds are said to have a warmer and more intense pure green color. Zambian emeralds are said to have a cooler, more bluish green color. Generally, Zambian emeralds are deep green with slight bluish overtone.

Lab Zambian Emerald Square shape Princess Cut Hydrothermal Gemstone

lab Created Sapphire stone Color Chart:

CUBIC CRAFT LIMITED (Chang Jiang Gems) build in 1994,We supply Lab stone,such as CVD/HPHT.LAB CREATED SAPPHIRE.MOISANITE,SPINEL,CORUNDUM,NANO,OPALNATURAL STONE,GLASS in many shape/size/color. 

Feel free to contact me if you have any questions.