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Thread: Ruby Real or Fake?

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  1. #1

    Dec 2012
    10
    1 times
    All Types Of Treasure Hunting

    Ruby Real or Fake?

    How can I tell if this is a real ruby?
    It was purchased in 1969.
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  2. #2
    Charter Member
    us
    Jul 2012
    Blackfoot, Idaho
    White GMT, DFX, Coinmaster, old Garrett Masterhunter BFO
    957
    640 times
    Prospecting
    Two things to try. Ruby is corundum, and the 2nd hardest natural substance. (MOHS hardness 9.0) Try and scratch a piece of quartz with it. Quartz has a hardness of 7.0-7.5, so real ruby will scratch it. Also, ruby is very heavy...specific gravity is 3.9-4.1. If you're willing to remove the stone from it's setting, you can do a specific gravity test. Very few gems are heavier than ruby.
    Jim
    austin and StoneWhisper like this.

  3. #3
    us
    The Beard "WP"

    Feb 2012
    North West Iowa
    Bounty Hunter
    805
    261 times
    All Types Of Treasure Hunting
    Thanks for that info. I have a red stone that was with some old coins and I have always wondered how to tell.
    "The greatest danger to American freedom is a government that ignores the Constitution."
    -Thomas Jefferson

  4. #4
    se
    Sep 2006
    Sweden
    White's or Minelab
    3,998
    306 times
    All Types Of Treasure Hunting
    I would have a gemmologist check that one out. Could be a synthetic ruby, to.
    Geologists are gneiss, tuff, and a little wacke.

  5. #5
    Charter Member
    us
    Jul 2012
    Blackfoot, Idaho
    White GMT, DFX, Coinmaster, old Garrett Masterhunter BFO
    957
    640 times
    Prospecting
    Good catch...I hadn't even considered a synthetic. I wonder how the SG compares in a synthetic? I also notice that spessartine garnets are close to corundum for specific gravity, though they have an orangish cast to the red color.
    Jim

  6. #6
    se
    Sep 2006
    Sweden
    White's or Minelab
    3,998
    306 times
    All Types Of Treasure Hunting
    It seems to clean, that it threw me off, hence the suggestion of synthetic.

    Synthetic ruby is still.. ruby, so SG is not diagnostic of a synthetic.
    One needs a good microscope and experience to tell a synthetic from the natural counter part, even then one can make mistakes. (did you know the flux grown can look amazingly natural?)

    Spessartites are also singly refractive, due to their cubic crystal structure.
    A quick test under a polariscope should help eliminate that.
    Geologists are gneiss, tuff, and a little wacke.

  7. #7
    us
    Apr 2010
    Annapolis Junction, Maryland
    789
    210 times
    Rocks, Minerals, Gems, Furs, Feathers, Mushrooms
    my main concern is that what appears to be one thing, may in fact not be what you think.. if you follow.. I have had others ask this same question only to learn that what they thought was a buby was nothing more then a heat treated crystal or even a topaz..
    Bird Watcher | Befriender Of The Squirrel | Escape Artist | Ex-Dumpster Diver | Trash Appraiser | Deep Thinker | Creative Tinker | Seeker Of Roads Less Traveled | Finder Of Dead Ends | A Keeper of Wisdom

  8. #8
    us
    Mar 2011
    204
    60 times
    Eu, if the SG is the same between a real ruby and a synthetic one, is the refraction index the same as well?
    Almost everything I have read relates to how to ID a raw ruby, not one that has already been faceted. From what I understand measuring the refractive index involves measuring the speed of light as it passes through the stone. I wouldn't have a clue how that is done.
    What other test would a gemologist do to ID this.

  9. #9
    luxefaire.com

    Dec 2005
    Jolly Corner FL
    Any
    51
    5 times
    All Types Of Treasure Hunting
    most times natural rubies will have inclusions within that the synthetics do not....i many times judge the possibility of real or synthetic by the mounting, its a good hint anyway. i dont like the 10k (Or is it 18k?), which is light quality for a ruby of that size and appearance, and the light color vs a darker....but i do like the style, it seems to be vintage perhaps. there are many good sources of gemological information on line, whole courses for free given by many authorities..it is an attractive stone one way or the other..b
    austin likes this.
    IS IT SAFE YET ?

  10. #10
    se
    Sep 2006
    Sweden
    White's or Minelab
    3,998
    306 times
    All Types Of Treasure Hunting
    Quote Originally Posted by Bajahunter View Post
    Eu, if the SG is the same between a real ruby and a synthetic one, is the refraction index the same as well?
    Almost everything I have read relates to how to ID a raw ruby, not one that has already been faceted. From what I understand measuring the refractive index involves measuring the speed of light as it passes through the stone. I wouldn't have a clue how that is done.
    What other test would a gemologist do to ID this.
    Yes, Refractive index would be the same. Synthetic ruby is EXACTLY the same thing as natural ruby, but lab grown.
    It is measured on a refractometer.

    Since it's set in a ring the tests one can do is limited. It's easier to ID a non mounted stone.
    What tests they do depends on what they think it is, or if they are to do it "correctly".
    If they are to do it correctly, then all possible tests are to be done. (i.e those which the setting does not disturb)
    Geologists are gneiss, tuff, and a little wacke.

  11. #11
    us
    Apr 2010
    Annapolis Junction, Maryland
    789
    210 times
    Rocks, Minerals, Gems, Furs, Feathers, Mushrooms
    After viewing the images again.. I feel its Synthetic or even plastic/glass in other words fake.. I guess I say this because my class ring (which was very simular to the above ring) didn't have a real sapphire in it..

  12. #12
    se
    Sep 2006
    Sweden
    White's or Minelab
    3,998
    306 times
    All Types Of Treasure Hunting
    I'd guess it isn't glass nor plastic. Why? The facet edges don't look to rounded, which is often the case with glass and plastics.
    Geologists are gneiss, tuff, and a little wacke.

  13. #13
    us
    too many hobbies...

    Jul 2009
    Battle Creek, Mi
    Mine lab, Garrett, Bounty Hunter,
    577
    75 times
    Not ruby but maybe a red Garnet? I have an antique ring with a huge red stone that when I bought it the jeweler told me it was a garnet and not ruby and it is the same color as yours....

  14. #14
    us
    Mar 2012
    432
    256 times
    All Types Of Treasure Hunting
    how long have they been able to grow rubies?

  15. #15
    us
    too many hobbies...

    Jul 2009
    Battle Creek, Mi
    Mine lab, Garrett, Bounty Hunter,
    577
    75 times
    Quote Originally Posted by rodoconnor View Post
    how long have they been able to grow rubies?
    I remember synthetic ruby rods for early laser experiments in the late 60's

 

 
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