Galignani's Paris Guide, published in London in 1822, lists on page 580 Garnaud as being 'Jeweller to H.R.H. the Duke d'Angoulëme' and gives his address as 62 rue Richelieu.
Louis Antoine of France, Duke of Angoulëme (1775-1844) was the eldest son of Charles X of France and, from 1824 to 1830, the last Dauphin of France. After his father's abdication in 1830, he enjoyed a reign of just twenty minutes, and after his father's death in 1836 was the legitimist pretender as Louis XIX of France and Navarre.
Gioacchino Barberi (1783-1857) who worked in Rome at 99 Piazza de Spagna, near the Spanish steps, was recorded in 1847 by G. Moroni (Dizionario di erudizione storico-ecclesiastica, Venice, 1847, XLVII, pp. 79-80) asone of the leading artists of miniature micromosaics. His father Paolo Emilio, was a painter and his uncle, Cavaliere Michelangelo, was another famous micromosaic artist. Gioacchino is credited with the use of black enamel smalti which he used for backgrounds, a device taken from wall paintings at Herculaneum.
An enamelled gold snuff-box by Jean-François Bautte & Co. set with a signed micromosaic by Barberi depicting a pair of small Spitz in lion clip on a leopard skin was sold Christie's, London, 22 May 2001, lot 250.
A gold snuff-box by Moulinie, Bautte et Moynier set with a signed micromosaic by Barberi and depicting a spaniel lying with two dead pigeons at its side, within a landscape was sold at Christie's, London, 6 December 2005, lot 26.
A further example, a vari-coloured gold bonbonnière by Alexander James Strachan set with a signed micromosaic by Barberi of a dog and a cat fighting in a landscape is in The Rosalinde and Arthur Gilbert Collection now at the Victoria and Albert Museum, see C. Truman, The Gilbert Collection of Gold Boxes, Volume I., Los Angeles, 1991, pp. 328-329.