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Gemstone Identification Natural verses Man-Made

This topic contains 9 replies, has 5 voices, and was last updated by Profile photo of sydp sydp 10 months, 2 weeks ago.

Viewing 10 posts - 1 through 10 (of 10 total)
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  • #200073
    Profile photo of jleearnold
    jleearnold
    Participant

    Hello everyone I am new to Gemstone identification

    I have acquired several stones just to test and get comfortable with the testing
    One of the Stones is a Blue/Clear 20 carat Stone

    Color
    Density and RI show it to be in the Quartz Family
    I have investigated color and clarity and I am stumped – how do you tell the difference between Aquamarine and Man-Made Blue Quartz???

    Attachments:
    1. Blue-Quartz-SA-002-003

      Blue-Quartz-SA-002-003.jpg

    #200135
    Profile photo of editor
    editor
    Keymaster

    I feel pretty confident saying just by a cursory glance (which is VERY rare) that it isn’t aquamarine. My guess is “man-made” material…

    Likely glass, is my guess. https://www.gemsociety.org/article/glass/

    #200146
    Profile photo of sydp
    sydp
    Participant

    Hi just on this subject, if the RI and specific gravity indicates quartz, then if could not be Aquamarine as the RI and SG are totally different to quartz.
    I also agree with the editor, the colour is totally wrong for Aquamarine even if you didn’t do an RI and SG
    thanks

    #200150
    Profile photo of jleearnold
    jleearnold
    Participant

    Thank you – I am reexamining the stone – I obviously have something wrong

    #200151
    Profile photo of jleearnold
    jleearnold
    Participant

    Thank you I am reexamining the Stone – I obviously have something wrong

    #200242
    Profile photo of jleearnold
    jleearnold
    Participant

    As You can tell By my freshly uploaded self portrait I have issues with my eyes – LOL
    Thank you for your honest replies it forced me to repeat my testing

    First thing I did was order a Computerized Refractive Index Meter to take my Eyesight out of the equation – Wish I could afford a computerized Spectroscope

    Here is what I found and my conclusions
    Shape – Oval
    Weight – 19.95 Carats
    Color – Blue Changing to clear
    Hardness – 7-7.5
    Specific Gravity/Density 2.59
    RI – 1.546
    Color Of Streak – White

    Conclusion – Iolite

    #200248
    Profile photo of rpentney
    rpentney
    Participant

    So how did you rule out assembled stones?

    #200251
    Profile photo of jleearnold
    jleearnold
    Participant

    OK – I also bought a 20x to 200x USB microscope that is viewable on my Computer and it shows no layering or separate colors

    Stone is pretty clean except some surface marks on the lower facets

    #200682
    Profile photo of mr-nopain4u
    mr-nopain4u
    Participant

    Hi 🙂
    I think/”feel” syntetic .,

    BUT ..if it is Iolite ..IF ??

    In that size and “close to picture image” ,, BIG CONGRATS 🙂

    (IF, IF, IF 😉 )

    #200812
    Profile photo of sydp
    sydp
    Participant

    Hi, I have noted on a fair few of the forum discussions that when people are referring to an RI of a gemstone they only state one (1) Refractive Index for a gem that is doubly refractive “Anistropic”

    just wanted to say if you do not undertake a proper RI Test then you cannot add this to the list of tests you need to undertake to identify a gemstone natural or synthetic
    one RI reading indicates single refractive index “isotropic” glass spinel garnet diamond etc
    if you are going to do an RI test on what you believe is an “anistropic” gemstone doubly refractive then you must take the lowest and highest reading by rotating the stone 360% on the refractometer to get the actual birefringence of the stone
    then you have the real RI.
    Unless of course your reading is down the C axis which will show a single RI on a doubly refractive gem. which of course you need to check on another facet besides the table

    thanks

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