Fancy Green Diamond

[lovedogs]

Antique jewelry is one thing; green diamonds are in a completely different class. No one would cut a green diamond like that as it would be too valuable to waste carat weight on that cut. If you really believed it was diamond, I am sure you would have already been to the GIA lab for analysis. ‘Nuff said - show us the cert when you get it!

Exactly. Plus it's incredibly clear that it isn't a diamond based on pics.

 

[Dmond]

Hello to everyone!!
Relatively recently, I checked the density with a basic hydrotest.
I didn't know about this test and no one warned me that it was extremely accurate, I have been able to verify the density of a small emerald of 0,08ct...
These are the pics with the results.


Discarding: Peridot, Moissanite, Cubic Zirconium, Metamict Zircon, green Beryl, Demantoid, Spinel, Sapphire etc.

 

[Garry H (Cut Nut)]

Hello to everyone!!
Relatively recently, I checked the density with a basic hydrotest.
I didn't know about this test and no one warned me that it was extremely accurate, I have been able to verify the density of a small emerald of 0,08ct...
These are the pics with the results.


Discarding: Peridot, Moissanite, Cubic Zirconium, Metamict Zircon, green Beryl, Demantoid, Spinel, Sapphire etc.

Specific Gravity (SG) = Weight in Air / (Weight in Air - Weight in Water)

1. Weight in Air = 1.49 gm
2. Weight in Water = 0.42 gm
3. Weight in Air - Weight in Water = 1.49 - 0.42 = 1.07 gm

SG = 1.49 / 1.07 = 1.39

Therefore, the specific gravity of the material is 1.39 - Diamond has an SG of 3.52
Most natural gemstones are significantly heavier:

• Quartz is around 2.65
• Ruby/Sapphire around 4.0
• Diamond is 3.52
• Even light gems like opal are around 2.15

Given the specific gravity of 1.39, this material is most likely to be: a plastic or resin imitation

 

[Garry H (Cut Nut)]

That said, your setup appears to be flawed.

 

[Starstruck8]

Specific Gravity (SG) = Weight in Air / (Weight in Air - Weight in Water)

1. Weight in Air = 1.49 gm
2. Weight in Water = 0.42 gm
3. Weight in Air - Weight in Water = 1.49 - 0.42 = 1.07 gm

SG = 1.49 / 1.07 = 1.39

Therefore, the specific gravity of the material is 1.39 - Diamond has an SG of 3.52
Most natural gemstones are significantly heavier:

• Quartz is around 2.65
• Ruby/Sapphire around 4.0
• Diamond is 3.52
• Even light gems like opal are around 2.15

Given the specific gravity of 1.39, this material is most likely to be: a plastic or resin imitation

I think @Dmond is claiming to have measured the weight of water displaced (not the weight in water), using this procedure: Place the cup partly filled with water on the scale. Zero the scale. Hang the stone in water, fully submerged but not touching the sides or bottom. Note the scale reading. On this assumption, taking everything at face value, the SG would be about 1.49 / 0.42 = 3.54.

@Dmond, have you allowed for the water displaced by the hanger? i.e., zeroed the scale with the hanger in the water without the stone? Or alternatively, use a light thread to hang the stone.

@Dmond, do you still think your stone is a diamond (which is consistent with the indicated SG)? If so, as many others have said, send it to GIA and show us the report. Or have you rightly given up this delusion, and do you genuinely want to know what it is? On the indicated SG, given the likely accuracy, spinel (possibly synthetic), topaz (possibly treated) and some sorts of garnet are in the frame. But if you really want to know, and you want to convince anyone else, DIY gemmology won't cut it. You will have to send it to a lab, even if it may not be worth the cost of a report.

 

[Rfisher]

kudos to @Garry and @starstruck for the experiential and empirical knowledge to point out and ask the important questions.

All I can add is where does Christopher Walken /FBS fit in, given it’s prominent intentional placement?