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 Post subject: Sapphire Inclusion - Nat vs Synth
PostPosted: Thu Apr 10, 2014 1:04 pm 
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Joined: Fri Jul 01, 2011 2:37 pm
Posts: 18
Location: Texas
Hello everyone, I have a blue sapphire here I am questioning whether it is synthetic or natural. Unfortunately it is mounted, and there is no color banding or growth lines to be seen either straight or curved. I apologize for the terrible photo, but I had to compress the image for the file size restriction and really do not have a great microphotography set up. The stone has the usual fingerprint and silk inclusions I would expect to see in a sapphire, but also has this ugly looking tubular inclusion that seemed odd to me and very reminiscent of flux. It has rust-like coloration in places along the tubes, and the central blob area is a dark grey-brownish. Any insight would be greatly appreciated, thanks!

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 Post subject: Re: Sapphire Inclusion - Nat vs Synth
PostPosted: Fri Apr 11, 2014 3:12 am 
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Joined: Wed Mar 26, 2014 8:23 am
Posts: 253
If there are lamella twinning, hollow tubes, mineral inclusions, silk: genuine sapphire

If curved striae and gas bubbles or wispy veil-like liquid feathers: synthetic corundum sapphire

Yesterday I had an Indigolithe for to examine but it was'nt - it was a synthetic spinel dark erinite international colournumber 136. UV was blueish fluorescence. I often note the size additionally. Most synthetics have standardsizes with low tolerance in messuring (with exception grinded by hobby faceters :wink: ).

Edit: I forgot to mention that refering synthetic sapphire, only the outer skin of the roughboule can be used. For large stones can be recognized the color compression while at another location more light colour is visible.

Sorry I'm new here, the experienced ones will certainly give their reports.

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