 |  |  | |   | |  | | Partially dissolved rutile silk in a Vietnamese ruby. The partially dissolved silk is indicative proof the stone has been heated to high temperatures. | | | | | | |  | | White clouds are a common inclusion in heat-treated rubies from Mong Hsu. | | | | | | |  | | A heat-treated Mong Hsu ruby clearly showing the white cloudy area. | | | | | | |  | | Another heated Mong Hsu ruby with characteristic white cloudy inclusions. | | | | | |  | |  |
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