Unusual Phenomenal Colored Stones | GIA Knowledge Sessions Webinar Series

GIA Knowledge Sessions Webinar - recorded live on September 30, 2021.
From star sapphires to opals to alexandrites, phenomenal gems are nothing short of, well, phenomenal! They each have special properties that allow them to interact with light in an unusual way, causing them to display effects such as asterism, play-of-color and color change. Journey along with GIA researchers Aaron Palke and Ziyin Sun as they dive into the science and mystery of phenomenal gems, nature’s rock stars.
Read more of Dr. Aaron Palke's research:
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[@johnt5465]

Coming from jtv to GIA moving up! CONGRATS!

[@stevensvideosonyoutube]

This is looking interesting.

[@cristinalago1981]

Fantastic Presentation!

[@anna-zn5fb]

So fun as a student to watch these!!!

[@deeosil]

Thank you GIA!

[@panaceiasuberes6464]

Such unusual stones... and the proof that beauty is a very complex characteristic.

[@KathyJeanActress]

Thank you.

[@johnny_pilot]

Thank you, miss Jayden. 😊

[@kolkatagems]

Thanks for sharing such a great knowledge

[@dpm2971]

Hi Peter, been a fan of your channel for about a year now. In this episode, you use your three-color type torch. Could you provide the type and brand, please?

[@mineralsspecimen8357]

Nice👌

[@ronnieboucherthecrystalcraftsm]

the best stone = has GEM FIRE ! in a nut shell !

[@LOOOVEIT]

GIA should only allow Tetrachromats to be certified to assess colored stones.

[@thediamondcollector1328]

👍👍👍👍

[@khaledsalem955]

I have stones

[@ronnieboucherthecrystalcraftsm]

it is not good light return it is breaking light into it`s own bands and refracting the spilt light through the stone = GEM FIRE ! i hate these guy`s the waffle on about crap for a job !