The update page listed these rings under the newly added synergy... synthed with the newly added stones, also listed on the new items page. There's also eight of them..
Bought these dumb things before new rings were released, for 200k, and now cant sell back to save my life, even at 100k. Have yet to see a sale in months, so I would craft these with caution in regards to the listed sale price.
They've never been made, there's been countless cases of crafters getting the HQ Animation, and only netting an NQ result. Infact, I have seen this for myself and can confirm that it's true. It would also explain why there have never been any sold. Even the rarest items have been sold on some auction houses.
personally, I'm amazed that the price is so high on these, even tho they are new, due to the fact that Strigoi Ring has been out for a while now and the NM that drops it is not to difficult.