Find your diamond
Find your jewelry
shape
carat
color
clarity

17.1ct Cut Zircon - Thoughts?

oz_prospector

Rough_Rock
Joined
Apr 1, 2020
Messages
7
Hi there!

I was recently gifted/inherited this stone and just trying to find out if it's worth sending in to get a certified evaluation done. The only info I received with the stone was that it's 17.1ct zircon.

Here are some pics I've taken -- note that the white paper brings out the blue/green quite a bit more than visible with naked eye, which is a very slight blue tinge -- otherwise on casual inspection it looks clear/white. Any thoughts much appreciated!

IMG_20200402_133123.jpg IMG_20200402_133158.jpg IMG_20200402_133222.jpg IMG_20200402_133240.jpg IMG_20200402_133328.jpg
 
  • Like
Reactions: AV_

dk168

Ideal_Rock
Premium
Joined
Jul 7, 2013
Messages
5,635
Based on the photos alone, I do not believe it is a Zircon as I cannot see any double refraction which is indicative for Zircons.

Can't tell what else it could be as there are a number of CSs that could look like it.

DK :))
 

oz_prospector

Rough_Rock
Joined
Apr 1, 2020
Messages
7
Ahh! Hmm... in that case I'm thinking I should try and do a specific gravity test to narrow the possible options? I've done an SG test before to calculate gold weight of a specimen I found prospecting -- just have to refresh my memory on the process and I'll give it a go.

Thanks!
 

Bron357

Ideal_Rock
Premium
Joined
Jan 22, 2014
Messages
4,115
With the blue green and yellow, could it be a parti sapphire? Very pretty in any regard.
How exciting.
 

oz_prospector

Rough_Rock
Joined
Apr 1, 2020
Messages
7
Hmmm.... so I did a SG test, albeit a proper "macgyver" job using whatever I could find which gave me a SG result of 3. However certainly not convinced it was an accurate measurement so I'll try and find someone around my area that is properly equipped to do refraction/SG tests... for the time being it's a guessing game... hoping it's more than just quartz! :(
 
Last edited:

Tartansparkles

Shiny_Rock
Joined
Feb 23, 2017
Messages
202
Does it throw off rainbows when it catches the light? If it is a zircon I'd love to know how much a stone of that size dazzles! (To check for double refraction my jeweler draw a line on a piece of paper and viewed the line through the stone and hey presto, two lines appeared. Might be something else to try if you haven't done so already).
 

oz_prospector

Rough_Rock
Joined
Apr 1, 2020
Messages
7
Oh it's that easy? Does it matter which part of the crystal you look through?

Edit: Just had a try and assuming I'm looking through it on the right angle it does appear to have some refraction but it's not consistently clear as it wiggles around.

Oh and not seen any rainbows on it
 
Last edited:

oz_prospector

Rough_Rock
Joined
Apr 1, 2020
Messages
7
Could it be Topaz?
Yeah if it's not zircon then topaz would be most likely I think... still crossing my fingers that it's zircon or aquamarine but I'm a little pessimistic now. I'm taking it to a gemologist to get it tested and hopefully identified later today/tomorrow -- will update with results!
 

oz_prospector

Rough_Rock
Joined
Apr 1, 2020
Messages
7
Yeah so took it to a gemologist who did a quick refraction test and she's, pretty certain, it's topaz. Said it's a nice piece as it doesn't appear to be heat treated, so it's a nice natural subtle blue -- but alas, not Zircon. :'(
 

Bluegemz

Ideal_Rock
Premium
Joined
Apr 22, 2017
Messages
4,098
Well, a natural blue topaz is lovely too! I think it has a beautiful, almost aquamarine like color with a little bit of green in it. Very subtle color which IMO is elegant.
 

MissSarah

Shiny_Rock
Joined
Mar 13, 2014
Messages
164
It's really pretty and isn't it unusual for topaz to be unheated? Very cool stone to get as a gift. What are your plans? It would be pretty in a pendant.
 

dk168

Ideal_Rock
Premium
Joined
Jul 7, 2013
Messages
5,635
Natural unheated Topaz are not difficult to find, and I am fortunate to have 2 cut by Doug Menadue of Bespoke Gems from a massive rough a few years ago.

DK :))
 

oz_prospector

Rough_Rock
Joined
Apr 1, 2020
Messages
7
Yeah it's still a very nice piece and I'll perhaps have it set as a pendant or something one day -- though not sure if the green/yellow tinge you see in the pics is really part of the stone or just reflection of the metal on the tape measure or something because it only appears a feint blue when looking at it in my fingers.

Just to be certain I decided to do another SG test, this time fine-tuning my testing setup and making it as accurate as possible, and I got a SG of 3.37 which falls right in line with what I'd expect from Topaz (within margin for error) -- so at least now my mind is at ease with confidence that I know what it is. :bigsmile:
 
Last edited:
Be a part of the community It's free, join today!
    Three-stone engagement ring upgrade
    Three-stone engagement ring upgrade
    Vintage OEC Bracelet
    Vintage OEC Bracelet
    June’s Birthstone Trinity
    June’s Birthstone Trinity

Need Something Special?

Get a quote from multiple trusted and vetted jewelers.

Holloway Cut Advisor



Diamond Eye Candy

Click to view full-size image.
Top