What is alexandrite gemstone? & why it is much more expensive than diamond? snapthesis 

I'm a geologist, not the most expensive or rare of gemstones, alexandrite is a color change chrysoberyl. Taaffeite, musgravite, red beryl, benitoite, pezzotite, vorobyevite(cesium beryl), podidurite and carbon allotrope diamonds( lonsdalite/ impact diamonds) Are the rarest.

My birth stone alongside the pearl.

Beautiful ❤❤❤😮😮😮😊

Hello, I have a number of stones that I think are valuable and I wanted to know about their market. They said that some of them are Martian meteorites. One of them said that there is a high probability that it is an emerald. I am from Iran, thank you

Good video

Very beautiful .

I have two Alexandrite I want to seel it

Saya punya sudah di ikat pakai cincin perak dan mau di jual.....

လှပသောအရောင်များနဲမျဝေလိုက်သည်

Александрит ?

Don't use robotic AI voices