Bi-colour, colour change lab stone

[Double E]

Is lab rough with bi-colour or colour changing characteristics common? such as sapphire or other CS examples which are also welcomed.

Are these more difficult to grow?

And are there any vendors famous for this type of stones?

 

[dk168]

Gary has a couple of colour-change lab gems listed on his website at the moment, an Alex and a Sapphire:

Lab Gems at Finewater Gems

DK

 

[Double E]

Gary has a couple of colour-change lab gems listed on his website at the moment, an Alex and a Sapphire:

Lab Gems at Finewater Gems

DK

Thx. Gary’s stones are beautiful. These kind of LG stones seem to be rarely seen when I browse the inventory on many famous vendors who supply LG gems, so why I was curious about the availability and the reason behind

 

[Double E]

And what I more usually found is alexandrite , but examples of sapphire are more limited.