Translations for thirty-nine in French

Here are paragraphs from public domain books translated:

" 'Precisely.' He opened the case, and there, imbedded in soft, flesh-colored velvet, lay the magnificent piece of jewelry which he had named. 'There are thirty-nine enormous beryls,' said he, "and the price of the gold chasing is incalculable. The lowest estimate would put the worth of the coronet at double the sum which I have asked. I am prepared to leave it with you as my security.'	« — Justement. » Il ouvrit l’écrin, et me montra, ressortant sur un beau velours couleur de chair, le magnifique bijou en question. — Il y a trente-neuf énormes béryls, et le prix de la monture en or est incalculable. L’estimation la plus basse équivaudrait au double de la somme que je vous demande ; je vous laisserai ce diadème en garantie.
The Adventures of Sherlock Holmes, by Arthur Conan Doyle	Les Aventures de Sherlock Holmes, de Arthur Conan Doyle