Carnelian ID tips?

[goopy soul]

Already searched the forum and most replies lean toward shop recommendations, which is helpful but I'm trying to learn how to ID Carnelian myself.

My sister and I went to a gem fair in Eugene last weekend and saw a chunk labeled "natural Carnelian" from a booth that had mostly Brazilian pieces. It's got a deep orange-red color but the edges look almost too perfect. I read that a lot of Carnelian now is just dyed agate, especially coming from India or China.

Is there a way to tell if it's been heat-treated or dyed?

 

[RegUser]

Hi @goopy soul! I usually check for banding and any color bleeding around cracks. Dyed agate tends to look extra bright, almost like it’s glowing, and sometimes feels a little waxy. Did yours have any pale or white patches mixed in?

 

[goopy soul]

Hi @goopy soul! I usually check for banding and any color bleeding around cracks. Dyed agate tends to look extra bright, almost like it’s glowing, and sometimes feels a little waxy. Did yours have any pale or white patches mixed in?

The piece I saw didn’t have much banding but the edges looked darker and almost painted and I didn’t notice any white patches. Would heat‑treating alone ever give that kind of edge effect or is that more of a dyed agate giveaway?

 

[jasmin3tea]

I usually check the color, cause a natural carnelian has a cloudy, variegated color and may have slight variations in shade due to inclusions. If the color is a uniform, overly bright, or perfect orange, it is likely fake.
try to hold it up to the light, the genuine carnelian is translucent, so light should pass through it
also feel the temperature, natural stones feel cold to the touch and do not warm up quickly in your hand, unlike some fakes made of glass or resin, which can feel warm