Featured Mark on modernist ring with color change sapphire

I know it's a long shot, but does anyone recognize the mark on this ring? It is not cleanly stamped, and these are the best of many photos I took. I'm getting TCB or TCK and 05 or 65.
According to my gemologist, this is a synthetic color change sapphire, magenta and purple, which you can see in the photos taken in regular room lighting vs. my photo lights.
Thanks!

 

Beautiful, drg. The mark looks like a Mexican post-1980 Taxco mark. I don't remember seeing one with three letters though.

 

I think you are right, it does look like a Mexican mark, I don't know why I didn't think of that. When I was searching for similar style rings, the few that I saw were mostly from Mexico, but older.

 

Let's wait for the others though, I am not too sure about the three letters.

 

The USSR, Egypt & Mexico all made a lot of jewellery using Russian lab grown color change sapphires. Marks aren't Egyptian. The shape of the cartouche(s) is similar to Soviet Union



but not the contents. So if it looks like Taxco to you guys, it probably is.

 

I can't add anything..except. nice ring AND ..great photos !!!!

 

Absolutely!

 

The hallmarks in the ring are neither Russian nor Soviet.

 

We know. That does not mean the stones are not.

 

Agree with AJ that it “looks” Mexican but I know of no 3 digit Mexican stamp and would not think it’s Mexican. In Mexican stamping, the first digit is the known area of manufacture and T for Taxco is the most common. The second letter should be the first initial of the last name of the artist. The number (05) signifies that the artist would be the 5th one to register that letter initial stamp in Taxco. There is no code for that other letter and since this stamping didn’t start until 1979 the piece should also be stamped “made in Mexico”.

Could it be another country (possibly Asian) trying to copy Mexican code?

 

@drg642 You have not brought out all the colors the stone can exhibit. In sunlight you will see a lot of peacock blue mixed with the purple. The right kind of fluorescent can make these look entirely blue. Under UV light they are a completely other beast.

 

I think Asian, Indonesian maybe. I've rings with that setting marked just 925. Modern ones, nice tho'.