Sapphire frin Vault

CPOL · **Joined:** Mon Sep 26, 2022 9:04 am **Posts:** 6

Pulled this from my Vault - tested, confirmed in all aspects as a natural sapphire

cannot do chemistry, so i needed to ask

First though (GOLDEN SAPPHIRE)

I listed in indoor light, and with a color correcting loupe - then put it under an LED where it showed a strong light Greenish Yellow - yellow

Is that normal for Yellowish brownish orange sapphires? or may there be an additional trace element in it that may make it special (chameleon)

roshanravan · **Posted:** Sat May 18, 2024 2:04 pm

CPOL wrote:

Pulled this from my Vault - tested, confirmed in all aspects as a natural sapphire

cannot do chemistry, so i needed to ask

First though (GOLDEN SAPPHIRE)

I listed in indoor light, and with a color correcting loupe - then put it under an LED where it showed a strong light Greenish Yellow - yellow

Is that normal for Yellowish brownish orange sapphires? or may there be an additional trace element in it that may make it special (chameleon)

what kind of tests have you done to confirm it's sapphire?
and what is color correcting loupe!?.
Any pictures?

CPOL · **Joined:** Mon Sep 26, 2022 9:04 am **Posts:** 6

refractometer , polariscope, chelsea, spectrometer, darkfield for inclusion only & gravity test

cant seem to upload from my computer - suppose i need a place to save pics to online

CPOL · **Joined:** Mon Sep 26, 2022 9:04 am **Posts:** 6

color correcting loupe is of german design with a crystal spherical concave lens set that allows TRUE COLOR Observation.
it was made by BELOMO and has been with me for many years, though I could never find it in the market..
I got it at Nikin labs years ago , I suspect they were investigating production

roshanravan · **Posted:** Sun May 19, 2024 9:23 am

CPOL wrote:

color correcting loupe is of german design with a crystal spherical concave lens set that allows TRUE COLOR Observation.
it was made by BELOMO and has been with me for many years, though I could never find it in the market..
I got it at Nikin labs years ago , I suspect they were investigating production

I don't understand what a 'color correcting loupe' is. unless you meant standard gemologist and diamond grading loupe!
For Color Grading or testing any gemstones. a gemologist needs a Non-reflective Surface & Neutral white Background, Daylight-equivalent Light Source (CRI preferably 90 or above + temperature of around 5500 to 6500 Kelvin ) without interference from external light sources, The gemstone should be viewed at a consistent distance typically around 10-12 inches (25-30 cm) from the light source.
you can use a triplet loupe which consists of three lenses bonded together to correct for color distortion (chromatic aberration) and curvature (spherical aberration), ensuring a clear and accurate view. these are the standards. unless the loupe you mentioned have these details then it's not a standard gemological magnification.

you still didn't clarify about the tests that you have conducted for identification. and again as i just explained above, LED is not a correct light source at all.

1bwana1 · **Joined:** Thu May 12, 2016 2:18 am **Posts:** 1567

My understanding is that Belmo makes high quality triplet loups. A triplet loupe design corrects for optical aberrations such as distortion and chromatic fringing. The glass chosen is designed not to impart and color cast. This is one reason that they are considered to be suitable for diamond graders. This is expected from all of the high quality triplet loupes. I see nothing in them that would account for a color shift in a sapphire however.

roshanravan · **Posted:** Sun May 19, 2024 12:05 pm

1bwana1 wrote:

My understanding is that Belmo makes high quality triplet loups. A triplet loupe design corrects for optical aberrations such as distortion and chromatic fringing. The glass chosen is designed not to impart and color cast. This is one reason that they are considered to be suitable for diamond graders. This is expected from all of the high quality triplet loupes. I see nothing in them that would account for a color shift in a sapphire however.

That's exactly my thoughts, at first because of mentioning the color shift, I thought he meant a color filter loupe like The Chelsea Filter or something similar...

In any case you see weird color changes specially in No heat Yellow Sapphires. their color stability changes when exposed to UV source or Sunlight. I have seen brownish Yellow (even with tint of greenish) sapphires

CPOL · **Joined:** Mon Sep 26, 2022 9:04 am **Posts:** 6

yep i understand and agree.
i also have a chameleon diamond that can got green to brownish AND to RED

perhaps all my years specializing in alexandrite and always running gems under the light table as a habit
I have caught a few oddities

this is just my latest mystery

perhaps send it to test chemistry - likely an obscure mineral which is unexpected

Barbra Voltaire, FGG · **Posted:** Wed May 29, 2024 2:18 pm

Please describe what you define as a chameleon sapphire.
Color change? Color shift?

CPOL wrote:

refractometer , polariscope, chelsea, spectrometer, darkfield for inclusion only & gravity test

cant seem to upload from my computer - suppose i need a place to save pics to online

Perhaps the pics are too large to upload smoothly.
Make them smaller and it should work.
If not, send them to ME and I will get them online.
gemologyonline1@gmail.com

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