Mixing lab and natural diamonds

[Dr_Diesel]

igi offers mass scanning of melee.

Diamond Screening

IGI offers the industry’s most advanced diamond screening and detection services to professionals and consumers.

www.igi.org

GIA does also.
Interestingly LGD lots are scanned to make sure they are not contaminated(their words) by mined happens a lot.

Another great resource! Thank you, Karl!

On a related note, AIGS is offering something similar for colored stones. They are offering mass screening for colored stone melee:

Gem School - Gemology School - Gemologist School

International Gemology School in Thailand Asia, Study Gem in Bangkok Thailand, Gem Laboratory in Bangkok Thailand, Gemstone Lab Report, gem school

www.aigsthailand.com

 

[Dreamer_D]

It’s wild how 4ct diamonds have become normalized.

 

[Rockdiamond]

Hi David, can you please also do this test - hard to know which you have - but on diamonds 405nm produces stronger blue fluorescence.
Test on US dollar bill security features:

• 395nm: brighter reaction
• 405nm: weaker reaction

I didn't have a single- on a $50 I got a strong reaction, on $100 a milder reaction....
But it's not really relevant to the point of the percentage of natural diamond Melee fluoresce.
I have checked many times over the years- having produced many rings. If I saw 50% fl, I'd have been concerned.
From my perspective, the lack of fluorescent diamonds isn't really conclusive of anything.
At this point, I assume any melee is lab, if it's colorless, and not fluorescent.
Oddly enough, brown ( like the brown in natural diamonds) is somehow non existent in lab diamonds.
So if you see brown melee, it's real

 

[Rockdiamond]

About the lab vs natural debate:
"Are you shopping for Natural or Lab diamonds?" seems a natural question to ask a potential client when we get a call asking about buying a diamond.
I'm finding that the majority of callers nowadays are looking for lab.
I think it's presumptuous to "steer" someone one way or the other.
I also think it's crucial to be open and honest.
If a client tells me the main reason they want a natural over a lab is for investment or re-sale purposes, I feel bound to give them my experience on how diamonds are not a good financial investment.
When a client says, I understand the financial implications, and I want natural that's their prerogative.
But nothing Rappaport or anyone can do to stop the market forces that exist.
his recent "adjustment" of the list is like taking a teaspoon out of a bathtub full of water. He's been ignoring the actual market for years.
He seems to be virulently anti lab diamond and I believe it's affected the list.

 

[freddyboston]

It’s wild how 4ct diamonds have become normalized.

"Scientists Were So Preoccupied With Whether Or Not They Could, They Didn’t Stop To Think If They Should" .... Jeff Goldblum's character Ian Malcolm ~ Jurassic Park

 

[nala]

It’s wild how 4ct diamonds have become normalized.

You mean 4 ct LAB diamonds?