Is This Brooch Authentic?

[snaphappy]

Platinum tested. But I don't see a platinum mark anywhere in the pics. No milgrain. I don't know if all of them have milgrain? A little over 3 carats total carat weight. I think the center diamond is OMC? But is it an authentic art deco piece? Thanks!

 

[newtojewels]

First, not an expert by any means.

I have an art deco platinum brooch from Lang with no hallmarks, I wouldn't think not having hallmarks is a worrisome sign. I think the main diamond is an OEC, not an OMC. I also don't think not having milgrain is a worrisome sign, again this is a brooch from Lang that they say is from circa 1925 and they're very reputable:

Art Deco Diamond Brooch and Dress Clips

The Chrysler Building - times two - is miniaturized (but shine every bit as bright) in these sensational and consummate geometric Art Deco double clips and brooch combo, crafted in platinum at the zenith of the period - circa 1925. Tree-like tacks of trapezoid and baguette diamonds serve as the...

www.langantiques.com

And more late Art Deco dress clips:

Late Art Deco Diamond Scroll Dress Clips/Earrings

How clever. These delightful, distinctive, and ingeniously designed late-Art Deco earrings are not only ready to add some fabulous flash to your ears, they also transform into chic, eye-catching dress clips. Two bright transitional round brilliant diamonds (total weight, .90 carat) center...

www.langantiques.com

I see nothing in your images that would worry me about its authenticity but again I'm by no means an expert. Recreating these brooches with antique diamonds would generally be more trouble than it's worth when someone could make other jewelry pieces that sell more readily like earrings and rings.

 

[snaphappy]

Your brooch is stunning!! TY for the help

 

[newtojewels]

Your brooch is stunning!! TY for the help

Just to be clear, that's not my brooch! I wish! This is mine, which I assume is a little earlier than yours or at least made by a more conservative jeweler: https://www.langantiques.com/art-deco-floral-bar-brooch.html

 

[snaphappy]

Did a little more research. I think it’s likely 1930s. I’ll share pics when it arrives