Turkish lexicography of the Ottoman era was represented until 17'th century by passive dictionaries including Arabic and Persian lexical entries also Turkish remarks and meanings. Any dictionary including Turkish lexical entries had not been written until 17 th century in the Ottoman Turkish period. The first dictionary including Turkish lexical entries in the Ottoman Turkish period is Alfaz-i Turkî-i Fârsî written by İbrahim Miskîn on 25 Safar 1075. In the 18th century, Osmanzade Ahmed Tâib's Mir'ât Al-Mushkil, Shaykh alIslam Mehmed Esad Efendi's Lahjat al-Lughat and İbrahim Vedîd's Jawahir al-Alsina followed the dictionary, respectively. The topic of this article is Jawahir al-Alsina which is the fourth active dictionary of the Ottoman Turkish period. In the article, Jawahir al-Alsina has been tried to be introduced with all aspects. There is restricted information in resources regarding this important dictionary. In this paper, acquired information with reference to the unique manuscript copy about the name, the author, the chapters, the manuscript copy, the vocabulary and the grammatical features of Jawahir al-Alsina have been presented. Furthermore, the preface of Jawahir al-Alsina has been transcribed and the images of the several pages of the manuscript copy have been added into the article.