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.

Hydrothermal Lab Created  Zambia Emerald Round Shape Stone 2.0MM  Melee stone

LAB CREATED SAPPHIRE 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.