An Art Deco diamond and sapphire brooch

An Art Deco diamond and sapphire brooch
of rectangular panel design with single-cut diamond fan terminals, the central section with collet-set old-brilliant-cut diamond single stone centre within a calibré sapphire square surround, flanked by single-cut diamond pierced rectangular sections with baguette sapphire borders, to a single-cut diamond surround, with square-cut sapphire two stone detail, circa 1930.