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If you're looking at a pinstem that's of modern length and apparently *hasn't* been snipped, the piece can't be older than the 1920s -- unless there are other indications of age and the pinstem has been replaced completely.
The real fun begins when you turn the piece over, because you can learn an enormous amount from findings (called fittings, if they're custom-made for the jewel); often you can discover more from the back than the front. Is there clear evidence of replacement (blobs of solder or a soldering pad, obvious regilding, etc.)?
If you aren't sure what this type of clasp looks like, an original is here: Page/1921804829(sorry for the glare) ...
and a later addition is here: Page/1921422784If you see a C-shaped clasp that seems to have two extra prongs functioning as a safety, this is the earliest type of safety clasp, used between the 1890s and about 1910.
If it isn't original, you know when it was added to an older jewel.
Look further for signs of a snipped pinstem; it should be extra-long or snipped.