The 923 you're seeing inside your ring is likely a stamp indicating the purity of the ring. 923 means that the ring is 92.3% pure gold or silver (whichever your ring is).
923 is not a stamp for sterling silver. Sterling silver is defined as being 92.5 percent pure silver as a minimum and is therefore usually stamped 925. 923 could be another mark than a purity stamp though.
The answer is 923.
There are 1000 mm in 1 meter 923 / 1000 = 923 x 10-3 = .923 meters
1
923 in Roman numerals is CMXXIII.
what hallmark 923 mean on a bracelet.
923 carrrots
230.75
840
13.1857
5 x 184.6 = 923