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 Post subject: Kashmir sapphire doublet?
PostPosted: Sat Apr 05, 2014 5:59 pm 
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Hello. I was hoping to get some information about a doublet stone, as I haven't been able to find much on the internet. The stone in question has an intense, vivid blue crown and a blue (but not intense) pavilion. The seam is visible, and it is set in an antique gold setting. I'm wondering if it may be a kashmir sapphire crown, but, unfortunately can't get a refractometer reading on it. My question is, were thin slices of kashmir sapphires used on doublet stones back in the day? Thank you...


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 Post subject: Re: Kashmir sapphire doublet?r
PostPosted: Sat Apr 05, 2014 9:45 pm 
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I'm wondering why you suspect Kashmir.
Why not another possibility?


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 Post subject: Re: Kashmir sapphire doublet?
PostPosted: Sun Apr 06, 2014 3:34 pm 
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Dear shelwoods, It is not a necessary that if the crown is dark color and pavilion is lighter then the stone will be doublet. May be during cutting the cutter do not care the orientations and cut the stone at wrong direction or orientations.
A good cutter always care the orientations. As following is the example
http://www.theimage.com/faceting/facet10a.htm

For seeing doublet you must see the profile (Girdle) of the stone.
For more information see the topic Assembled Gems in the below mentioned website
http://www.bwsmigel.info/Lesson9/DE.Syn ... lants.html

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 Post subject: Re: Kashmir sapphire doublet?
PostPosted: Thu Apr 10, 2014 5:07 pm 
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Sometimes depending on the orientation of cutting, a strong side dichroism can make you think you are watching a doublet, where actually there is none, and the seam at the girdle is just an illusion.


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 Post subject: Re: Kashmir sapphire doublet?
PostPosted: Sat Nov 08, 2014 11:13 am 
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Sorry for the delay, I hadn't seen the responses until today. I'm pretty sure it's a doublet, as I can see the flattened bubbles just under the surface, as well as a visible seam. The cap is saturated vivid blue, unlike any stone I've seen, and quite thin. I've read that natural stones were frequently used for caps so I thought possibly kashmir sapphire or cobalt spinel because of the color. The table is unscratched and shows no signs of wear, except for a little chip broken off the corner in the pavilion. With the unscratched surface, I thought more likely sapphire than spinel. I will post a picture of the ring. Thank you.


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 Post subject: Re: Kashmir sapphire doublet?
PostPosted: Sat Nov 08, 2014 1:58 pm 
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Here is a photo. The ring in question is on the top and glows in a camera flash. It isn't that bright in normal light. The sapphire on the bottom is for comparison. It is a nice quality, medium blue and silky.


Attachments:
File comment: Questionable stone and verified sapphire.
photo (4).JPG
photo (4).JPG [ 40.02 KiB | Viewed 591 times ]
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 Post subject: Re: Kashmir sapphire doublet?
PostPosted: Sat Nov 08, 2014 2:11 pm 
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Here is a side view of the ring.


Attachments:
File comment: The delineation is easier to see here between the crown and pavilion.
DSC02361.jpg
DSC02361.jpg [ 42.16 KiB | Viewed 589 times ]
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 Post subject: Re: Kashmir sapphire doublet?
PostPosted: Sat Nov 08, 2014 11:07 pm 
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Have you thought of taking to a gemologist/appraiser. If it couldn't be determined with microscopic observation, immersion in something that wouldn't harm the pearls would probably help.

So you suspect doublet blue on blue?


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 Post subject: Re: Kashmir sapphire doublet?
PostPosted: Sat Nov 08, 2014 11:43 pm 
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Yes I think so. I've not taken it to a gemologist for testing. There is an appraiser in my area so that may be the next step.


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 Post subject: Re: Kashmir sapphire doublet?
PostPosted: Sun Nov 09, 2014 12:05 am 
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Are any of these appraisers close to you?
http://www.najaappraisers.com/html/find ... raiser.php


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 Post subject: Re: Kashmir sapphire doublet?
PostPosted: Sun Nov 09, 2014 7:48 am 
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Thank you so much for sending this - the appraiser I was thinking of is on the list so that is good reassurance, and gives me more options as well.


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