Can corundum be diffused if it has intact rutile inclusions?

[LoversKites]

Simple question. Grateful for an answer

 

[Marlow]

Re: Can corundum be diffused if it has intact rutile inclusi

Is this a simple question???

You mean you have a lets say paleblue sapphire with long and thin unmelted rutile needles - no diffusion treatment course they would melt.

But if you put ice in a hot pan it depends on the size of the ice cube and how long it is in the pan.

Some rutile crystal are melted but you need maybe more then 10x to see that it is a line of melted "drops".

A microscope is a very helpful tool.

Another question are star sapphire with diffusion...

Not enough time now - later!

 

[minousbijoux]

Re: Can corundum be diffused if it has intact rutile inclusi

Is this a simple question???

You mean you have a lets say paleblue sapphire with long and thin unmelted rutile needles - no diffusion treatment course they would melt.

But if you put ice in a hot pan it depends on the size of the ice cube and how long it is in the pan.

Some rutile crystal are melted but you need maybe more then 10x to see that it is a line of melted "drops".

A microscope is a very helpful tool.

Another question are star sapphire with diffusion...

Not enough time now - later!

Right. Now for the simple answer (assuming it is a tiny ice cube in a BIG pan of BOILING hot water in there for a LONG time, lol): No! There will not be intact rutile if it has been diffused.

I like this system: the rest of us will answer the simple questions, and we'll let Marlow come in with the full equivocation and all the caveats for the not-so-simple question!

 

[LoversKites]

Re: Can corundum be diffused if it has intact rutile inclusi

Is this a simple question???

You mean you have a lets say paleblue sapphire with long and thin unmelted rutile needles - no diffusion treatment course they would melt.

But if you put ice in a hot pan it depends on the size of the ice cube and how long it is in the pan.

Some rutile crystal are melted but you need maybe more then 10x to see that it is a line of melted "drops".

A microscope is a very helpful tool.

Another question are star sapphire with diffusion...

Not enough time now - later!

I thought it was a simple question. Looking forward to the rest of your answer.

 

[LoversKites]

Re: Can corundum be diffused if it has intact rutile inclusi

Right. Now for the simple answer (assuming it is a tiny ice cube in a BIG pan of BOILING hot water in there for a LONG time, lol): No! There will not be intact rutile if it has been diffused.

I like this system: the rest of us will answer the simple questions, and we'll let Marlow come in with the full equivocation and all the caveats for the not-so-simple question!

 

[Marlow]

Re: Can corundum be diffused if it has intact rutile inclusi

It is no simple question course they develope so many kinds of treatment that the truth today is maybe wrong tomorrow ( garnet is never heated, spinel never treated)....

 

[Marlow]

Re: Can corundum be diffused if it has intact rutile inclusi

Found this

http://www.gemresearch.ch/news/Be_Treat/BeTreat.htm

Esp. the last pic with a blue halo ( Titane colors corundum blue ) around a rutile cristal ( remember the ice cube in a hot pan).

PS:

Ask TL - she loves Halos

 

[Marlow]

Re: Can corundum be diffused if it has intact rutile inclusi

http://www.gemresearch.ch/news/2011-12-19_Alert/Alert.htm

Look at the blue rim around the melted neg. cristal!!

Negative cristal in a corundum are in my opinion more important than some solid cristals - a clear SHARP neg. cristal is an evidence for low heat only - higher heat an they look frosted and opak

 

[chrono]

Re: Can corundum be diffused if it has intact rutile inclusi

Marlow is correct; the rutile is likely to still be there and may even be intact but there will be tell tale diffusion signs around it. As treatment method improves, the answers will change over time. I am very sure that surface diffusion leaves many rutile inclusions intact (cat's eye and star corundum).

 

[LoversKites]

Re: Can corundum be diffused if it has intact rutile inclusi

http://www.gemresearch.ch/news/2011-12-19_Alert/Alert.htm

Look at the blue rim around the melted neg. cristal!!

Negative cristal in a corundum are in my opinion more important than some solid cristals - a clear SHARP neg. cristal is an evidence for low heat only - higher heat an they look frosted and opak

Great info, thank you.

I am very sure that surface diffusion leaves many rutile inclusions intact (cat's eye and star corundum).

Gah, I completely forgot about surface diffusion.

 

[SapphireStyle]

Re: Can corundum be diffused if it has intact rutile inclusi

Really informative thread, thanks for this!