As the OP acknowledges, the photos are not very clear, so what follows is a best-guess scenario based on a mark that is not 100% legible.
Thinking strictly in terms of Chinese / Japanese characters, the mark does resemble the two characters
佳 and 隹. Both of these characters are most commonly used in proper names, but not as part of a guarantee or standard for precious metals.
Thinking in terms of Asian hallmarks on silver and gold, it is more likely that the character is
銀 ("silver") and that the ring is goldplating over silver. The first photo certainly looks like this silver mark. Sometimes this mark becomes elongated when stamped on the inside of a ring, or becomes indistinct if plating is applied over it.
While older Asian gold jewelry may be entirely unmarked, I believe that nearly all Asian gold jewelry produced since the end of WWII, whether for domestic or international markets, has been marked in karats, e.g., 12K, 14K, 18K. On some Japanese gold jewelry, the stamp is K14, K18WG (18 karat white gold), and so on--for instance, see the cigarette cases with gold inlay marked K24:
viewtopic.php?f=13&t=33959&p=88216&hilit=k24#p88216I have never seen Asian gold stamped .9999, but perhaps this ring is the exception. Comparing with many other Asian pieces, the greatest probability is that the ring is Korean .9999 silver with goldplating. The OP can confirm this by comparing the mark on the ring to the
銀 silver mark pictured in Korean silver marks sections of the "World Marks" page:
http://www.925-1000.com/foreign_marks3.html Hope that this is not a disappointment.
DR