This question doesn't have enough information to give an answer, because it doesn't mention the coin's denomination.
In 1913 Wheat Penny value at an average of $1.25, one in certified mint state.
George the 5th by the grace of god, king and emperor of india... ish that the answer?
In circulated condition, your Great Britain penny is worth about 50 cents.DanUser:WorkingMan
"GEORGIVS V DEI GRA BRITT" is the start of the motto "GEORGIVS V DEI GRA BRITT OMN REX FID DEF IND IMP", which is in turn abbreviated Latin for "George the Fifth, By the Grace of God, King of All Britain, Defender of the Faith and Emperor of India". This full motto is found on British coins issued in 1918, and variants of it are found on the coins of several British colonies and Commonwealth nations of the time. However, Britain in 1918 had no coins whose denomination was 25 anything, and none of the other nations that had 25 Cent coins in 1918 used that motto (Canada was close, but their motto read "GEORGIVS V DEI GRA REX ET IND IMP" ("George the Fifth, By the Grace of God, King and Emperor of India").
King George V wasn't on any coins until 1911.
It means .50 in U.S. coin
I do not think it will devalue the stone any, but it has certainly devalued the coin. Modified coins have no collector value.
rex et imp nickel worht ate 1935
George V coins were issued from 1911 to 1936 inclusive.
A George V Dei Gra Rex Et Ind Imp one-cent Canadian coin is worth about $5. The value will fluctuate based on market demand.
This question doesn't have enough information for an answer because you didn't mention the coin's denomination. Also, it's redundant to ask what the value of something is worth.
...Post a new question including the denomination. All you've done is told us you have a coin struck in the UK (or the commonwealth) in 1917. Prices vary wildly depending on the denomination of the coin.