Giovanni Grancino (1637–1709), son of Andrea Grancino, was one of the early Milanese luthiers, and may have worked with his brother, Francesco.
Grancino's workshops were all located on Contrada Larga, now Via Larga in Milan. His instruments bear the characteristic segno della corona (mark of the crown).
Although the luthiers of Milan created instruments of varying quality, Grancino's violins, violas, cellos and double basses are considered superior. Grancino used a varnish which was a finely textured clear yellow to pale brown color.
Grancino's early instrument patterns and designs were influenced by Niccolò Amati of Cremona, whose impressive works influenced many Italian luthiers of the period. However, Grancino's later productions show flatter arching and narrower form under the influence of Stradivari. Grancino's cellos tend to be larger than others, yet with a clear sound characteristic of the Italian luthiers.
The Grancino manufactory was continued by members of the Testore family. The eldest of them, Carlo Giuseppe Testore, built a violin for Grancino which is now housed in the National Music Museum on the campus of the University of South Dakota.
Among Grancino's students was the Milanese luthier Giovanni Vasallo.
Grancino's violins play an interesting role in fiction. Canadian author, Emily-Jane Hills Orford's (born Toronto, 1957) novel, "Spring" (PublishAmerica 2005), features a Grancino violin with a mystery to unravel. American Harold Decker's self-published novel, "I, Giulia: The View Through F-Holes," recounts the life of his treasured Grancino violin. Canadian children's performer, Peggy Hills, (born Toronto 1950) also featured a Grancino violin in her children's recording, "Peggy's Violin", which was nominated for a Juno in 2007.