Art glass with a bit of blue here and there. French. Eugène Rousseau, artist and dealer. Living from 1827 to 1890, Rousseau had a shop in Paris starting in around 1855. Starting out with porcelain, he later shifted to glass, collaborating with several manufacturers including Appert Frères.

Vase in colored, smoked, etched and enameled glass. ca. 1875-1878. Maker’s marks: Signed “E Rousseau Paris” on the underside. Image © 2020 Sotheby’s. Fair use license. via https://www.sothebys.com/en/buy/auction/2020/important-design-3/vase

Vase decorated with fish and waterweed. Mold-blown and enameled with applied relief. 1878. French. Japonisme. Eugène Rousseau, designer. Appert  Frères, manufacturer. Image © Victoria and Albert Museum, London. Fair use license. via https://collections.vam.ac.uk/item/O1757/vase-rousseau-francois-eugene/
Blown crystal vase decorated with polychrome enamels and gold of falling polychrome tears and a rush around the neck made of colored glass, modeled and applied hot. ca. 1885. French. Designed by Rousseau. Probably manufactured by Appert  Frères. Maker’s marks: signed “F. ROUSSEAU”, engraved under the base. Image © Ader Auctions, Paris. Fair use license. via https://www.ader-paris.fr/en/lot/89706/8912908?

Glasses in jewel-colored glass with silver overlays. So pretty they almost don’t need flowers. Art Nouveau from the turn of the century a few centuries back. Made by Alvin Silver which imported the glass vases and applied the silver overlay, by a process they held the patent for.

Vase. ca. 1900.
Vase with glass in blue and purple with peach. ca. 1900. Glass attributed to Loetz with an Alvin Silver overlay. Image © 2019 Spencer Marks Ltd. Fair use license. via https://www.spencermarks.com/products/loetz-glass-attributed-with-alvin-silver-overlay-vase-c-1900

Vase. ca. 1900.
Vase with cranberry glass and an iris silver overlay motif. ca. 1900. Glass from an unknown maker with an Alvin silver overlay. Image © 2019 Heritage Auctions. Fair use license. via https://www.pinterest.com/pin/217861700695486742/?lp=true

Cobalt blue aurene bud vase. ca, 1900.
Cobalt blue aurene bud vase. ca, 1900. Loetz glass with an Alvin sterling silver overlay. Image © 2012 LR Antiques, Houston. Fair use license. via https://lrantiques.com/products-page/austria/0745-loetz-sterling-silver-overlay-cobalt-blue-aurene-bud-vase/