Find your diamond
Find your jewelry
shape
carat
color
clarity

Ruby have foreign material in surface reaching fractures

OTL

Brilliant_Rock
Joined
Jun 27, 2012
Messages
1,349
Please someone enlighten me, I was shopping around for rubies and found this uneated ruby, it is certified no heat, but have foreign materials in surface reaching fractures. I thought foerign materials such as lead glass need heating to be filled in. Is there something I missed?

Thanks in advance!
 

cm366

Shiny_Rock
Joined
Oct 5, 2011
Messages
433
"Heat' is probably being used to describe temperatures high enough to change the crystal structure and dissolve inclusions such as rutile silk. There's no way I'm aware of to identify whether corundum has been heated to, say, 200 degrees - and there isn't typically any benefit from doing so because you don't get the changes in colour or clarity from high heat. There are a few papers floating around about benefits from heating at only 350 C or so, and you'll sometimes see those stones sold as 'traditional low heat only' or similar, but your lab might mean the 1300-1800 degree bake.

Foreign materials would also include things like plastic resins or even oil, which certainly don't need much heat to be applied....
 

chrono

Super_Ideal_Rock
Premium
Joined
Apr 22, 2004
Messages
37,367
I don't think oil or resin needs high heat or even heat to coat any surface reaching fractures. Oil is typically applied under vacuum but I'm not as sure about the method of application for resins, especially since there are many different types of resins.
 
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