Lab grown sourcing?

[keystone]

I'm curious how people go about the sourcing of lab grown gemstones? Any recommended vendors? How does one evaluate quality and value? I came across the website below and the prices seem too good to be true, which obviously makes me even more hesitant. Has anyone had experience with this vendor?

Buy Loose Gemstones Online - CZ Stones, Natural and Synthetic Gems and Stones for Sale

Welcome to Gems n Gems – the best site for all kinds of loose gemstones at factory prices. Buy Loose Cubic Zirconia stones, Synthetic gemstones and Natural gemstones available here.

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Thanks for sharing your wisdom.

-Keystone