18:29

Gemology: Corundum Ruby 2

12:54

Gemology: Gem Deposits 2

55:31

Hilde Cronwright - Kimberlite indicator minerals and microdiamond techniques for diamond exploration

16:13

1 Million Dollars in Sapphires - Most Colorful Gemstone?

20:04

Emmanuel Fritsch: “‘Boehmite Needles’ in Corundum Are Rose Channels”

7:32

Vein Sediments

8:35

Buying and Selling Gems

10:47

How To Clean Corundum Ruby and Sapphire Propst Farm