www.925-1000.com

kЮЗ or kЮ5 only this clearly for me on this ring in live
the rest is blurred in the same way as you see in the picture

OK, take my word, it is silver. End of discussion

I do not know yet whether it is gold certainly
surely you need to check with goldsmith
for now I'm looking information on the internet
Personally for me, this looks like a platinum metal
I also given me :
- Костромской ювелирный завод
- Красносельский ювелирный завод
- Киевский Ювелирный Завод (КЮЗ)

mark for gold used 1927-1956 in Russia

http://img844.imageshack.us/img844/1257/0695.gif

http://imageshack.us/photo/my-images/844/0695.gif/

Message from the Ukrainian colleague :
Ring manufactured between 1927-1956
in Киевский Ювелирный Завод
if the ,,lopatka,, are the numbers 375 or 583 it is gold
if 875 it is silver, If 950 this platinum

Why you don't hear us? Please, listen.
Such mark of the producer (a letter + the last figure of year) was used in the Soviet Union only since 1953. Not earlier. Therefore if in mark of the producer there are letters K, Yu and figure (3,4,5,6. ), it was made after 1953.
Next. If in assay mark there is "a head of the worker", and there isn't "a star with a sickle and a hammer", it was made before 1958. Assay mark "lopatka" was used for all jeweller metals in period 1954-1958.
If in assay mark there is greek letter "nu" ( in left part) - it's Kiev. If greek letter "tau" - it's Kostroma (Selo Krasnoe).

There is nothing difficult. You will understand. ))

I think it's silver 875. Use simple test for silver. Or go to jeweller.

thank you for responde !
what test ?

I have better pictures
I did today


http://imageshack.us/a/img708/5933/cv3o.jpg
http://imageshack.us/a/img22/9601/e2se.jpg
http://imageshack.us/a/img14/3105/rnnd.jpg
http://imageshack.us/a/img534/1183/xjin.jpg
http://imageshack.us/a/img17/8329/vjk8.jpg
http://imageshack.us/a/img22/8104/3y49.jpg