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Help identifying stone

This topic contains 10 replies, has 6 voices, and was last updated by Profile photo of lgems lgems 2 months ago.

Viewing 11 posts - 1 through 11 (of 11 total)
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  • #219787
    Profile photo of detrelucide
    detrelucide
    Participant

    Hi there. I have had this stone for a little over a year now. Since then I have taken to gemologists at high end jewelry stores to be looked at, diamond buyers, and others in the trade and industry to help identify. Apsolutely no one know what stone it is, just that it is a natural stone. I have no way of finding out the RI of this stone and have literally no tools to do so either. My microscope was stolen, so I no longer have this either. I was able to look at through the microscope though a few times. It was difficult to focus because of the odd shape and large size though. It created halos around the stone which hurt my eyes so I didn’t look at it for long.

    I have confirmed it does have veil and fingerprint inclusions which are all grouped near the cutlet. There are some in other areas but this cut quite literally makes them disappear and reappear all depending on lighting conditions. It seems they help it reflect light at you because those areas of the stone can blind you when light is directed straight at the table. I posted the photo of this for you to see.

    It also has a mirror type effect. At first glance you assume you are seeing through the stone. When examined, you are actually seeing the reflection of you and everything around you. This was confirmed the other day when I finally got a decent photo of my phone light inside the gem stone through the table. It was not even distorted, it was equivalent to a mirror image. at that moment I understood why it was so hard for me to previously capture focused pictures of it with a light source, it was reflecting the light right back at my lens. I posted the photo of this for you to see.

    This stone has tested as a diamond before on two different diamond testers. The presidium diamond mate a and also a cheap one from the Internet. It doesn’t do it all the time though, which is also weird. At first I thought maybe it was a colorless sapphire. Then I thought perhaps a colorless tourmaline. I also can’t pin point the specific cut. It’s mixed between a rose cut, briolette and a cushion.

    If anyone can shed light on this it would be very helpfull. I’m out of ideas.

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    #219792
    Profile photo of detrelucide
    detrelucide
    Participant

    More photos

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    #219802
    Profile photo of detrelucide
    detrelucide
    Participant

    Wanted to show u the effect I get when using a polarized filter with my lens to cancel out the glare. The gemstone literally reflects an exact image of itself back into my lens and then the filter helps to focus it into a mirror image of itself next to it. I can only capture this though when taking a video. I’m assuming this is because it so double refractive.

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    #219859
    Profile photo of rpentney
    rpentney
    Participant

    Maybe try hauling that puppy out of the setting for a specific gravity and hardness test?
    Bill Hanneman’s homemade refractometer is simple to make and can read any range of ri. definitely worth a try since you will not be limited by any ri liquid. Cheap too!
    Very nice polish.
    What does the girdle look like?
    Moissanite?

    #220002
    Profile photo of detrelucide
    detrelucide
    Participant

    I actually put it in the setting so I could wear it. The specific gravity test is a good idea though. But in order to get a pin point number and not just an idea how would u go about doing that. I know you can weigh it and then weigh it in water and just divide the numbers but isn’t that just a rough idea of what the specific gravity could be? Because the weight of the string etc..

    #220004
    Profile photo of detrelucide
    detrelucide
    Participant

    I will loom up the refractometer ur talking about I had no idea about it thank you!!

    #220048
    Profile photo of shussain
    shussain
    Participant

    im just curious it may be kunzite? as a layman technique…if you put kunzite in sunlight it would get a bit darker in few hours…
    just try it:)
    specific gravity as suggested may give certain answer..

    #220050
    Profile photo of detrelucide
    detrelucide
    Participant

    I thought about kunzite also. But kunzite is a beryl and beryl has no thermal conductivity so it wouldn’t make sense for it to have a reaction to the diamond tester, especially testing as a diamond. But I had no idea kunzite got darker in the sunlight that is good information thank you.

    #220202
    Profile photo of sydp
    sydp
    Participant

    It could be moissanite but did not think they made them that big, could it be zircon??? will not get an RI on a normal refractometer if it is

    a specific gravity test on a big gem like that would be reasonably accurate normally not so accurate on a gem that is less than a carat as far as I am aware

    #220620
    Profile photo of rslechter
    rslechter
    Participant

    Getting a reliable SG should be fairly easy with a stone this size. I use an Ainsworth Analytical Balance with a sensitivity of 1/40 of a milligram (0.000025gm). However, you can get a good reading even with a Ohaus Dial-A Gram scale (has a pedestal to support a beaker, etc). I don’t recommend using string. Suggest using a thin bailing wire. String entrains air and will throw your wet weight measurement off…sometimes very significantly. Also, weigh the stone dry both with and without the wire so you know the wire weight. Then when weighing it in distilled water, go in deep enough to just completely submerge the stone. Most of the wire will be out of the water. Subtracting the wire weight from the wet weight will give a closer representation of the stone’s actual wet weight.

    #221128
    Profile photo of lgems
    lgems
    Participant

    This is a wild guess, DR ?. Could it be a Danburite?
    RI = 1.6
    SG = 3
    uV long and short: inert to strong

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