Coin and Paper Money Collecting/Rajaraja copper kasu

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Question
what was the ratio of a copper kasu coin of RajaRaja to a silver kasu and also to a gold kasu.?

Answer
Interesting question for which I also would like to know the Answer.

I posted your question on southasiacoins@yahoogroups.com
which has all the experts on Indian coins. I got only one reply so far.
Steve Bridges, of Chesapeake, Virginia, USA referenced

Desikachari's book, South Indian Coins,
"Whether there was any definite ratio between the value of gold and
silver or whether the value of gold fluctuated with that of any other
commodity and was determined in silver are matters upon which it would be
rash to hazard even a conjecture."

I found an interesting reference in Village Folk Tales of Ceylon
By Henry Parker 1910 page 420
http://books.google.lk/books?id=Y9sF5T_pH20C&pg=PA420#

The Gold, Silver and Copper Massa coins were all around 4.5 grams
The Gold coins of RajaRaja Chola were about 12K
i.e. 50% Gold 40% Silver 10% Copper

In Value
Gold to Silver Ratio was 1 to 10 to 15
Silver to Copper Ratio was 1 to 60

So putting all this together the order of magnitude Guesstimate is

1 Gold   coin was worth 500 Copper coins
1 Silver coin was worth  50 Copper coins

Copper Massa of RajaRaja Chola are very common.
However today the Silver coins are more rare to find than the Gold
which implies they minted far less silver coins than Gold coins, or
more of the silver coins got melted.

It is clearly a subject that needs more study.
If you find better answers please e-mail me at kavanr at gmail.com

Ref to studies of western coinage see
http://gold-money.hubpages.com/hub/The-Silver-to-Gold-Ratios
http://www.economics.utoronto.ca/munro5/MONEYLEC.htm  

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Dr Kavan Ratnatunga

Expertise

I can only answer any question regarding Paper Money, coins and Tokens that circulated in Ceylon/Sri Lanka of any era which extends back to 300 BCE. I maintain website notes.lakdiva.org and coins.lakdiva.org which may help you identify your banknote or coin. If Country is any other or unknown, coin should have been found in Sri Lanka. Please Do not ask questions about any coins or currency of other countries including USA. Thank You.

Experience

I maintain since 1998 the largest website on Ceylon/Sri Lankan coins and Tokens with over 900 pages.

Organizations
Former President Sri Lanka Numismatic Society founded in 1976

Publications
Sunday Times NewsPaper of Sri Lanka. See lakdiva.org/suntimes

Education/Credentials
BSc MS PhD in Physics/Astronomy Diploma in Museology

Awards and Honors
Contributor on Ceylon/Sri Lanka for Krause Standard Catalogs of World Coins and Paper Money.

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