Benvenuto Cellini (1500–1571). Autobiography.
The Harvard Classics. 1909–14.
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As I have above related, the Duke came daily into our goldsmith’s workshop for several hours; and about a week after this conversation with Antonio Landi he showed me one day after dinner the diamond in question, which I immediately recognised by its description, both as to form and weight. I have already said that its water was not quite transparent, for which reason it had been cropped; so, when I found it of that kind and quality, I felt certainly disinclined to recommend its acquisition. However, I asked his Excellency what he wanted me to say; because it was one thing for jewellers to value a stone after a prince had bought it, and another thing to estimate it with a view to purchase. He replied that he bought it, and that he only wanted my opinion. I did not choose to abstain from hinting what I really thought about the stone. Then he told me to observe the beauty of its great facets. I answered that this feature of the diamond was not so great a beauty as his Excellency supposed, but came from the point having been cropped. At these words my prince, who perceive that I was speaking the truth, made a wry face, and bade me give good heed to valuing the stone, and saying what I thought it worth. I reckoned that, since Landi had offered it to me for 17,000 crowns, the Duke might have got it for 15,000 at the highest; so, noticing that he would take it ill if I spoke the truth, I made my mind up to uphold him in his false opinion, and handing back the diamond, said: “You will probably have paid 18,000 crowns.” On hearing this the Duke uttered a loud “Oh!” opening his mouth as wide as a well, and cried out: “Now am I convinced that you understand nothing about the matter.” I retorted: “You are certainly in the wrong there, my lord. Do you attend to maintaining the credit of your diamond, while I attend to understanding my trade. But pray tell me at least how much you paid, in order that I may learn to understand it according to the way of your Excellency.” The Duke rose, and, with a little sort of angry grin, replied: “Twenty-five thousand crowns and more, Benvenuto, did that stone cost me!”
Having thus spoken he departed. Giovanpagolo and Domenico Poggini, the goldsmiths, were present; and Bachiacca, the embroiderer, who was working in an adjacent room, ran up at the noise. I told them that I should never have advised the Duke to purchase it; but if his heart was set on having it, Antonio Landi had offered me the stone eight days ago for 17,000 crowns. I think I could have got it for 15,000 or less. But the Duke apparently wishes to maintain his gem in credit; for when Antonio Landi was willing to let it go at that price, how the devil can Bernardone have played off such a shameful trick upon his Excellency? Never imagining that the matter stood precisely as the Duke averred, we laughingly made light of his supposed credulity.