Your link did not work for me. However, if the two piece lids and rings don't fit, then they should only be used for making candles or something. Paraffin is not recommended for jams. It leaks and allows molds to grow. There is no seal airtight seal on them. Jams and jellies need processing just like any other food.
Molds are not harmless, they contain mycotoxins that cause certain cancers.
Perhaps you can put the link in the box at the bottom of a post, it says "optional Link URL". You put the link in the box and then put the name in the box below.
We can help more if we can see the link.

here is the link. For some reason I didn't have that option.

There are no threads on the jar. It's obviously a ball quilted jelly, but the top of the jar looks like the commercial jelly jars that you buy.

Here is a link that might be useful: an example

Those are the old type that were used for paraffin. I use my old ones for little dipping dishes or for desserts or refrigerator storage.
Here is a link as to why paraffin is no longer used:
Note: Jelly jars and paraffin are no longer recommended. An incomplete seal with paraffin and the absence of a heat treatment may result in mold growth and toxin production in the jelly. Persons continuing to use the paraffin/no water bath method should be aware of the potential health risk.

Here is a link that might be useful: Paraffin on jelly jars.

Do you know if you can buy plastic lids for them? They're quite attractive and I'd like to use them for gifting refrigerated jam...I have a lot of shut ins and church members that I give jars of jam to and if I could use these for that it might be nice with a lid or a little bit of colored plastic wrap on the top and a ribbon.

Of course, i guess we could use them for drinking glasses or pudding cups.

They would make nice candle cups too.

I was more concerned that they might be "worth" something - is that actually not the case? I don't want to make candles out of them if they are worth dollars a piece. I'd rather sell them and buy new.

Thanks everyone.

I've got 4 or 5 of those too.
I just use them for temporary storage in the fridge.
IF you can find metal or plastic lids, you could freeze in them short term. It won't be an airtight seal, so it won't work for long term storage.

They sure are cute. Let me know if they are worth big $$$$, OK? :+)
I got mine in a box of canning jars purchased at a garage sale.
Deanna

I also have a dozen of them and no, they aren't worth big bucks. Not really worth small bucks even, but I like mine. My dozen was a gift from Gardengrl, who also thought they had the rings and lids and didn't know what to do with them otherwise. Mine are short and round and have metal red lids.

Some of mine are in my kitchen, they make a great "salt pig" for my sea salt, so one holds Fleur de Sel, one red Hawaiian sea salt, one plain white kosher salt. They are just the right size and shape to dip a "pinch" of salt out of. Another one holds packages of Equal and they are great holders for "sprinkles" when the granddaughter and I make cookies.

Annie