Mid-century style flower brooch with the Cartier mark. But there should also be a serial number and this item should be 18k. And that weird other mark, arrow through crescent, which is some other jeweler’s Hallmark. The pin mechanism is all wrong for Cartier, too. I think someone got their hands on a Cartier stamp and pulled a flim flam.
I’m just happy to have a 14k brooch(I tested it), 11.3 grams, paid $2.80. When I first found it, I actually got dizzy right there in the thrift store.
Very nice pin. I agree on it not being Cartier. But I have only seen the 10k, 14k, and 18k marks on the clasp part on karat gold pieces. I might be able to find the manufacturer if you take a better photo of the stem hallmark.
I did some research on the arrow/crescent mark, and couldn’t really get a good match on any jewelry mark data bases that I looked at.
I’ll take another pic here in a minute,
So anyway, it’s not Cartier 
Here is a closer view of the mark.
I reached out on another jewelry website when I first found it, and people there had mixed reviews about it’s authenticity.
I was thinking at the time, attributing to Henry Blank and Co, but I can’t really be sure.
Nothing matches my database. I do think if it was Cartier it should have assay marks and possibly a serial number.
@StevesTrail Thanks for looking! I’ll probably never know who made it, but not Cartier. It’s a cool brooch, regardless!
A beautiful, classic pin. Oh my, what an incredible deal you got. Agree it’s not Cartier, though. At first, I thought the hallmark might be “CA” with an arrow through it for “Carl Art” but, that doesn’t look to be the case.
(I have a ring that I may post here. Stamped “Cartier Paris” but, I think it’s a fake hallmark, too.)
@Stracci @StevesTrail I luv “rolling” rings & bought this one many years ago at a pawn shop. It’s rose, white, & yellow gold. Stamped “Cartier Paris” “750” and “51”(size). 750 & 51 are European marks. The very weird thing is the marks on the outside of each band. Even with my very good Bausch & Lomb loupe, the marks aren’t identifiable. This makes me believe the ring is a fake Cartier. Any thoughts on it?
Your ring has a good chance of being a vintage Cartier Trinity ring. The out of focus stamps look French. Crisp photos would help.
Enormously counterfeited. Cartier can authenticate for you for a price. You’d want to know if it’s from the main line or the later, more inexpensive Muste de Cartier. Many iterations of the 3-color Trinity have engraving on the rose gold band, on the exterior (top surface)–either showing “Cartier” or “Les Must de Cartier.”
Wow, thank you! Cartier Trinity ring - I haven’t heard of that name before. I had a heckuva time trying to get these photos - the ring wouldn’t cooperate, lol. I’ll try for a clearer pic on those weird stamps but no promises.
Thank you for this information. I feel like I now have a lead to at least begin some research. The exterior of the bands only have those oddball stampings, no printed words.
All Trinity rings have the Cartier logo, metal purity, and a unique serial number on the inside of a band. I will admit the assay stamps on the outside are unusual and I don’t see any Cartier Trinity rings like that.
In general, assay marks would typically be for the European market.
@StevesTrail Thanks for your additional input! There is no serial number on any of the bands. It’s most likely not legit, and that’s ok. Didn’t pay too much for it, it’s a perfect fit, and I’ve always liked it 
.
It’s still worth its weight in gold. Give the gold market another 6 months and it might be worth the same as the Cartier.
Your ring is quite the puzzle!
It looks like you have the sterling Boar’s head assay mark and a lozenge marker’s mark with “GP”.
Neither of which should be on a Cartier gold ring, as far as I know? Maybe someone was having fun with stamps, just like on my brooch!
But I know nothing about these matters, just making observations😋
It is really cool and a very desirable look in the world of fine jewelry. I would rock that ring, real or faux!
Yes, a sterling assay mark would certainly make no sense if it was Cartier, since the Trinity rings come only in 18K gold (or platinum).
You have much better eyes than mine.
You’ve got sharp eyes! Thanks for your help in decoding this mystery. I’ve never even come close to figuring out those marks. The ring is soooo comfortable to wear - it feels like silk on my finger.
@chicfarmer @Stracci @StevesTrail Thank you for all your help, information, and discussion about my mystery rolling ring. I appreciate it!
