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Antique Silver, Gold, Demantoid Garnet and Diamond Brooch The openwork brooch centering and quartered by 5 round demantoid garnets approximately 3.50 cts., encircled by 12 old European-cut diamonds approximately 1.70 cts., quartered by diamond-set scroll work, approximately 6.2 dwt.

Antique Silver, Gold, Demantoid Garnet and Diamond Brooch The openwork brooch centering and quartered by 5 round demantoid garnets approximately 3.50 cts., encircled by 12 old European-cut diamonds approximately 1.70 cts., quartered by diamond-set scroll work, approximately 6.2 dwt.

Acorn Brooch of pearl, diamonds, gold and silver - René Lalique, France, 1880 © Albion Art Museum / © VG Bild-Kunst, Bonn 2012

Acorn Brooch of pearl, diamonds, gold and silver - René Lalique, France, 1880 © Albion Art Museum / © VG Bild-Kunst, Bonn 2012

Gold, silver, and diamond brooch, set with an octagonal sapphire engraved with the arms of Johann Hugo von Orsbeck (1634-1711), appointed Archbishop Prince Elector of Trier, 13 July, and Bishop of Speyer, 16 July 1676, Abbot of Prum and Provost of Weissenburg. Now framed within a foliate border. German. Sapphire intaglio: 17th century. Setting: 19th century. Click for source and additional commentary by Diana Scarisbrick

Gold, silver, and diamond brooch, set with an octagonal sapphire engraved with the arms of Johann Hugo von Orsbeck (1634-1711), appointed Archbishop Prince Elector of Trier, 13 July, and Bishop of Speyer, 16 July 1676, Abbot of Prum and Provost of Weissenburg. Now framed within a foliate border. German. Sapphire intaglio: 17th century. Setting: 19th century. Click for source and additional commentary by Diana Scarisbrick

PERIDOT AND DIAMOND BROOCH An impressive Napoleon III brooch, the principal stone a 37.5 ct peridot surrounded by three graduating rows of old-cut diamonds weighing a total of 13.5 cts (approx), set in silver on gold. Circa 1890, with French import marks.

PERIDOT AND DIAMOND BROOCH An impressive Napoleon III brooch, the principal stone a 37.5 ct peridot surrounded by three graduating rows of old-cut diamonds weighing a total of 13.5 cts (approx), set in silver on gold. Circa 1890, with French import marks.

René Lalique Diamond ring. The large diamond is set vertically along the bezel, framed within a border of green leaves on black stalks, with the shoulders also enamelled dark green. By René Lalique c.1902-4.

René Lalique Diamond ring. The large diamond is set vertically along the bezel, framed within a border of green leaves on black stalks, with the shoulders also enamelled dark green. By René Lalique c.1902-4.

A Russian Demantoid Garnet and Fancy Colored Diamond Cluster Ring circa 1890, with a later shank The ring is set with an exceedingly rare 5.1 carat Russian Ural demantoid, encircled by a single row of six white and six fancy colored old cut diamonds with an approximate total weight of 1.80 ct. The dark grass green stone is full of 'valuable' so-called "horsetails", inclusions found only in demantoids from the Urals.

A Russian Demantoid Garnet and Fancy Colored Diamond Cluster Ring circa 1890, with a later shank The ring is set with an exceedingly rare 5.1 carat Russian Ural demantoid, encircled by a single row of six white and six fancy colored old cut diamonds with an approximate total weight of 1.80 ct. The dark grass green stone is full of 'valuable' so-called "horsetails", inclusions found only in demantoids from the Urals.

Bowknot earrings.  c. 1760. Gold, Silver, Diamond. English. Silver earrings, the top cluster joined to the drop shaped pendant by a bowknot, ribbons meeting at a centre cluster, set throughout with diamonds.

Bowknot earrings. c. 1760. Gold, Silver, Diamond. English. Silver earrings, the top cluster joined to the drop shaped pendant by a bowknot, ribbons meeting at a centre cluster, set throughout with diamonds.

A FINE GEORGE III DIAMOND FLOWER BROOCH  Designed as a clematis, the six old-cut pavé-set diamond petals to the diamond collet centre, mounted in silver, in closed back setting, circa 1770, 6.5 cm. wide, later brooch fitting, in blue velvet fitted case

A FINE GEORGE III DIAMOND FLOWER BROOCH Designed as a clematis, the six old-cut pavé-set diamond petals to the diamond collet centre, mounted in silver, in closed back setting, circa 1770, 6.5 cm. wide, later brooch fitting, in blue velvet fitted case

sapphire intaglio brooch

sapphire intaglio brooch

A Belle Epoque opal and diamond brooch, circa 1915. The oval-shaped crystal opal cabochon, measuring approximately 23.0mm x 18.2mm x 5.8mm, displaying exceptional play-of-colour of all spectral colours, set within a ribbon and floral garland surround, mounted throughout with millegrain single-cut diamonds, to the bow surmount, centring an old brilliant-cut diamond collet,  opal weighs approximately 13.80 carats, diamonds approximately 0.70 carat total, mounted in platinum and gold.

A Belle Epoque opal and diamond brooch, circa 1915. The oval-shaped crystal opal cabochon, measuring approximately 23.0mm x 18.2mm x 5.8mm, displaying exceptional play-of-colour of all spectral colours, set within a ribbon and floral garland surround, mounted throughout with millegrain single-cut diamonds, to the bow surmount, centring an old brilliant-cut diamond collet, opal weighs approximately 13.80 carats, diamonds approximately 0.70 carat total, mounted in platinum and gold.

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