Joined: Wed Jan 09, 2013 8:57 am Posts: 20 Location: Clarkston, MI
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...
Joined: Wed Dec 30, 2009 11:44 am Posts: 525 Location: PAKISTAN-Peshawar
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
Joined: Wed Jan 23, 2013 5:29 pm Posts: 1047 Location: Paris
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.
Joined: Wed Jan 09, 2013 8:57 am Posts: 20 Location: Clarkston, MI
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.
Joined: Wed Jan 09, 2013 8:57 am Posts: 20 Location: Clarkston, MI
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.
Joined: Sun Oct 16, 2005 12:22 pm Posts: 21602 Location: San Francisco
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.
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