is this possibly apart of a tiara from the russian crown jewels

[Toekneetang]

i was hoping you could help me in determining if you think that this brooch of mine has anything to to with this tiara, supposedly from the russian crown jewels..i know that i can see faberge and russian markings all over my brooch, and i have always felt that this had to have been apart of a larger piece of jewelry and then finally after weeks of searching online i came across this photo , which i put a photo i took of my brooch next to it to compare...can you get back to me?

 

[VRBeauty]

Not likely. If it were A piece of that specific tiara, it would have to be the Cluster in the center of the tiara based on the number of diamonds surrounding the center stone. The proportions of the center stone appear to my eyes to be different from those of your pin – the stone in the tiara appears to be "pudgier." It also looks to me as if the stones in the tiara are opals, and the center stone in your brooch is not an opal.

 

[Katesimone]

I agree with VRBeauty, the shape of the cabochon is wrong

 

[Katesimone]

I would be interested to see pics of the hallmarks if you have them?