Why many authors are wrong making ramllakota as Raolconda Diamond Mines of Jean Baptiste Tavernier

 that is because  none  of them  know  or speak  the  telugu language and  that is  what is spoken  in  the  Nizams  kingdom  where  Baptiste travelled.

No Telugu speaking  person  will confuse  konDa కొండ  with kOTa కోట
రావోల్కొండ రిటన్  "Raolconda "రవ్వల కొండ " by baptiste is recognized as ramallakota by many authors both British and  Indian.

But  it is actually  ravvalakonda "రవ్వల కొండ "(which means " diamond hill" not rama's fort!

This is a hill located near the  town of banaganapalli in Kurnool district of Andhra Pradesh.

TRAVELS IN INDIA. The Second Book. Containing an Historical and Political Description of the Empire of the Great Mogul.

At the two Mines about Raolconda in the Kingdom of Visapour, the payments are made in new Pagods, which the King coins in his own Name, as being independent from the Great Mogul. The new Pagod is not always at the same value; for it is sometimes worth three Roupies and a half, sometimes more, and some∣times less; being advanced and brought down according to the course of Trade, and the correspondence of the Bankers with the Princes and Governors.

At the Mine of Colour or Gani, which belongs to the Kingdom of Golconda, they make their payments in new Pagods, which are equal in value to the King of Visapour's. But sometimes you are forc'd to give four in the hunder'd more, by reason they are better Gold, and besides, they will take no others at the Mine. These Pagods are coin'd by the English and Hollanders, who, whether willingly or by force, are priviledg'd by the King to coin them in their Forts: And those of the Hollanders cost one or two per cent. more than the English, by reason they are better Gold, and for that the Miners choose them before the other. But in re∣gard the Merchants are prepossess'd that the Miners are a rude and savage sort of people, and that the ways are dangerous, they stay at Golconda, where the Work∣masters keep correspondence with them, and send them their Jewels. There they pay in old Pagods coin'd many ages ago by several Princes that Reign'd in India before the Mahumetans got footing therein. Those old Pagods are worth four Roupies and a half, that is to say, a Roupy more than the new: not that there is any more Gold in them, or that they weigh any more. Only the Bankers, to ob∣lige the King, not to bring down the price, pay him annually a very great Sum, by reason they get very much by it. For the Merchants receive none of those Pagods without a Changer to examine them, some being all defaced, others low-metal, others wanting weight: so that if one of these Bankers were not present at the receipt, the Merchant would be a greater loser, sometimes one, sometimes five, sometimes six i'th hundred: for which they also pay them one quarter in the hunder'd for their pains. When the Miners are paid, they also receive their Money in the presence of Bankers, who tells them which is good, and which is bad; and has for that also one quarter i'th hunder'd. In the payment of a thousand or two-thousand Pagods, the Banker, for his fee, puts them into a bag, and seals it with his Seal; and when the Merchant pays for his Diamonds, he brings the Seller to the Banker, who finding his bag entire, assures the party that all is right and good within; and so there is no more trouble.

As for the Roupies, they take indifferently, as well the Great Mogul's as the King of Golconda's: by reason that those which that King coins, are to be coin'd, by Articles, with the Great Mogul's stamp.

'Tis an idle thing to believe that vulgar error, that it is enough to carry Spices, Tobacco, Looking-glasses, and such trifles to truck for Diamonds at the Indian-Mines: For I can assure ye, these people will not only have Gold, but Gold of the best sort too.

As for the roads to the Mines, some fabulous modern relations have render'd them very dangerous, and fill'd them full of Lions, Tigers, and cruel People; but I found them not only free from those wild creatures, but also the People very loving and courteous.

From Golconda to Raolconda, which is the principal Mine, the road is as follows: the road being measur'd by Gos, which is four French-leagues.

From Golconda to Canapour, one Gos.

From Canapour to Parquel, two Gos and a half.

From Parquel to Cakenol, one Gos.

From Cakenol to Canol-Candanor, three Gos.

From Canol-Candanor to Setapour, one Gos.

From Setapour to the River, two Gos.

That River is the bound between the Kingdoms of Golconda and Visapour.

From the River to Alpour, three quarters of a Gos.

From Alpour to Canal, three quarters of a Gos.

From Canal to Raolconda, two Gos and a half.

( this is the  crucial part of the  journey from kurnoolకర్నూల్ to  raolconda (Canal to Raolconda,)  

with imprecise distance measurements of 17th century can be in error.

Thus from Golconda to the Mine, they reckon it seventeen Gos, or 68 French-Leagues.

From Golconda to the Mine of Coulour or Gani, is reckon'd thirteen Gos and three quarters, or 55 French-leagues.

Page  142From Golconda to Almaspinda, three Gos and a half.

From Almaspinda to Kaper, two Gos.

From Kaper to Montecour, two Gos and a half.

From Montecour to Naglepar, two Gos.

From Naglepar to Eligada, one Gos and a half.

From Eligada to Sarvaron, one Gos.

From Sarvaron to Mellaseron, one Gos.

From Mellaseron to Ponocour, two Gos and a quarter.

At Ponocour you only cross the River to Coulour.

CHAP. XV. The Rule to know the just price and value of a Diamond of what weight soever, from three to a hunder'd, and upwards: a secret known to very few people in Europe.

I Make no mention of Diamonds of three Carats, the price thereof being suf∣ficiently known.