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Diagnostic curved colour-zoning in Flux-melt (Verneuil) method synthetic Ruby.

Diagnostic curved colour-zoning in Flux-melt (Verneuil) method synthetic Ruby.

natural sapphire inclusions. Colour zoning and silk

natural sapphire inclusions. Colour zoning and silk

Hallmark inclusions of a flux-grown Kashan synthetic #ruby are translucent to opaque-white primary flux. Photo by Nathan Renfro.

Hallmark inclusions of a flux-grown Kashan synthetic #ruby are translucent to opaque-white primary flux. Photo by Nathan Renfro.

SDI: Where Creativity Meets Excellence.: RUBY - The Undisputed King of Gemstones (Part-2)

SDI: Where Creativity Meets Excellence.: RUBY - The Undisputed King of Gemstones (Part-2)

Distorted calcite guest crystal with 'treacle' colour swirls in unheated Mogok Ruby. Calcite is a common inclusion in Mogok rubies and treacle is a unique inclusion to these stones.

Distorted calcite guest crystal with 'treacle' colour swirls in unheated Mogok Ruby. Calcite is a common inclusion in Mogok rubies and treacle is a unique inclusion to these stones.

White clouds are a common inclusion in heat-treated rubies from Mong Hsu.

White clouds are a common inclusion in heat-treated rubies from Mong Hsu.

Another heated Mong Hsu ruby with characteristic white cloudy inclusions.

Another heated Mong Hsu ruby with characteristic white cloudy inclusions.

Elongated gas bubbles torpedo through curved striae within the depths of a Verneuil synthetic ruby. Photo © John I. Koivula/microWorld of Gems.

Elongated gas bubbles torpedo through curved striae within the depths of a Verneuil synthetic ruby. Photo © John I. Koivula/microWorld of Gems.

A heat-treated Mong Hsu ruby clearly showing the white cloudy area.

A heat-treated Mong Hsu ruby clearly showing the white cloudy area.

Synthetic hydrothermal emerald displaying flux patterns.

Synthetic hydrothermal emerald displaying flux patterns.

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