Garnet color triangle vintage brooch

⚠ Please refrain from price negotiations m(_ _)m
I will observe for a while and lower the price slightly if it doesn't sell, so I would appreciate it if you could wait until it reaches your desired price.
However, there is a possibility that someone else may purchase it if you wait too long, so please consider this carefully.
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This is a used item.

Purchased at a shop that handles vintage items.

Frame has blackening and dullness.

No engraving, material unknown.
I tried bringing a magnet close to it, but it did not stick.

Slightly heavy.