Welp, my first SCP turned out to be a flop. It felt overdone, and I ended up just throwing anomalous effects on it like unique Diablo creatures. I tried to make this one feel a bit more simple, while still maintaining that feeling of unease. Whether or not I actually accomplished that is up to you, I think it's a little better. But my opinion doesn't matter! Your opinion matters! Any feedback would be greatly appreciated!
This isn't bad! It's good that it's a focused idea with not too many extraneous details tacked on. It's worth noting that accelerated aging is an effect of an existing SCP, but that doesn't necessarily mean that an aging effect can't be used or done well. SCP-723 is the only one I know of that does this, so it isn't overdone or anything.
You might want to add some conditions - for instance, part of SCP-723's frightening factor is that it can't be fully observed without experiencing it for yourself. This condition or a similar one wouldn't work with a necklace, which gives you space to work with in order for you to distance your SCP from 723. You could try something such as, "When the necklace is removed from a Subject A aged by its effects, and placed on another subject, Subject B will gradually grow younger by the same amount Subject A aged, and no further." (I don't suggest emulating my example in its style of wording; I don't feel it suits the standard tone of an SCP article.)
In addition, you use the phrase "it is thought" often, as in "Two letters are engraved on the inside of the chain: █.█. These are thought to be the initials of SCP-XXXX's creator, though there is no method to confirm this," and "As discovered in Experiment E-XXXX-I, it is thought that SCP-XXXX accelerates aging by causing a temporary disorder similar to that of Werner Syndrome, which is only active when SCP-XXXX is worn." However, you do not provide evidence as to why these things are thought. Science is not purely speculative; it involves observation followed by hypothesizing. Why do the researchers think those are the initials? Why is it thought that it accelerates aging specifically through a disorder? Without being backed up by observation, these statements seem like baseless speculation. In addition, you have not provided a log of Experiment E-XXXX-I. If an SCP has been experimented on, the experiment log would be part of the article.
You have a good start here! I just suggest you take time to really flesh out your idea and make it unique and memorable.
Hell yeah! It's not bad! Thank you for all the suggestions, I'm adding an experiment log now! However, I'm a little stumped as to what I should add regarding other conditions, I was thinking of three things: 1. Affecting different genders/races/ethnicities differently, 2. Making it not only accelerate aging, but decelerate aging in some, or 3. Your suggestion, although maybe written differently.
I'll take some time to think about it in depth! Thank you for the help!
Big wall of text below for specific, piece-by-piece analysis and critique. Overall, I like the premise, and this is written pretty well all things considered. There are a few general notes I'd advise:
1.) General polish and cleanup (there's some examples and more specific stuff below)
2.) More scholarly/clinical language.
3.) Length. It's a little bit short as-is, and while a bit interesting, it doesn't really go anywhere.
4.) Medical terminology. This is perhaps the most important, because with the current direction of the article's presentation, this will make or break the entire article. Brush up on your lingo a bit.
As it stands, I'd have a neutral vote. This is a very good foundation for something that needs a bit more work to really come into its own.
Thank you for the help! I tried my best to clear up what I could, though I personally stuck with the double numbers as I personally prefer it. I also stated in the experiment log, that any direct observation of the processes described in the following paragraph was impossible; whether or not that was the right way to change that is up to you. And yes, the majority of jewelry you purchase would have a brand name and probably a serial number engraved somewhere on it. I also couldn't really think of an alternative to saying "bodily systems", most professional or medical documents I have seen used the same wording, though I might just be a total idiot.
Thank you for the help!