Here is an interesting post about the ring from Americas Most Wanted John Walsh from Scumhunter.
Post by Scumhunter on May 31, 2014 at 5:26pm
Hey, all of us are random posters on the internet so I can't say anything bad about that. I respectfully disagree with most of those opinions but they are interesting. I think the problem is the victim's time of death was unfortunately a tumultuous time for New York City.
I also feel the victim was a prostitute for a few reasons. Besides what was found on her body, the late 70's and 80's were rife with prostitution in New York City, especially in Times Square which although I don't know the exact apartment location she was found in, was probably close enough. My parents who would sometimes take me and my brother to New Jersey to visit friends and relatives would take side-streets when we came back late at night from the Port Authority to avoid the main ruckus. I hate saying this, but unfortunately there was probably so many prostitutes in the city during that time it might be impossible to identify this victim.
Also, as far as P McG is concerned, it might not have anything to do with the victim's name. I googled PMCG and jewelery and came up with this website:
www.augustadezines.co/Products.html
The description the Jeweler uses has on how she makes her jewelery is very intriguing and might explain the PmcG:
The metal jewelry I make is created from a new medium called Percious Metal Clay, or PMC. In the late 1980's Mitsubishi Materials Corporation was looking for profitable ways to use their mined and recycled precious metals. Precious Metal Clay is composed of precious metal particles (silver, gold, copper, bronze), a non-toxic organic binder and water. The binder allows the metal particles to stay together in a workable clay-like form.
(There is no "clay" in it, that is just a descriptive term for the form the metal is in prior to fireing.) The product is worked like a clay and then fired in a kiln at high temperatures. The heat burns of the binder and the water, the result is a solid metal with characteristics simiular to those of cast precious metal! PMC IS PURE METAL!
PMCS: Silver
PMCC: Cpper
PMCB: Bronze
PMCG: Gold
So if perhaps the victim's ring has to do with this abbreviation, and the artist who made precious metal gold, mentions it comes from the Mitsubishi Materials Corporation in the late 1980's, then it would put the victim's year of death more towards 1987 than 1979.
I'm not sure if it was just Mitsubishi that made these materials, but I'm willing to bet the ring could have possibly been sold in New York's diamond district which although I'm too young to know for sure seemed established in the mid-1980's based on what I could find on internet searches. The main thoroughfare is 47th street between 5th and 6th avenues which is in midtown Manhattan. Unfortunately, I'm not sure how easy it would be to discover a shop that could have possible sold the ring since I'm sure some stores replaced old ones and not all records are available.