Sources say that 926 means that the ring is made of yellow 22k (carat) gold.
926 is gold purity of 92.6%. Generally, all wearable gold is 92.6%.
If you see a 926 piece that is not yellow in colour, it means that the jewelry is plated over with another metal.
In the UK, hallmarking has a long history representing the earliest form of consumer protection.
Hallmarks are small markings stamped on gold, silver and platinum articles. A hallmark means that the article has been independently tested and guarantees that it conforms to all legal standards of purity. Read Hallmarks - British Hallmarking Council for more info.
Get helpful tips for finding the purity of your gold, silver, sterling silver and platinum jewelry from SilverRecyclers.com