A late Victorian gold opal and diamond crescent brooch, c.1890

A late Victorian gold opal and diamond crescent brooch, c.1890,
with a curved row of graduated oval cabochon opals, all claw set to the outside edge. Rows of graduated old eight cut diamonds, grain set between, to a two row underbezel. A later hand engraved presentation message to the interior guard, 'GG Brignell. Cambridge. Xmas. 1930'. Curved pin and later lever clasp. Tested as approximately 15ct gold and 9ct gold. 81 x 8.40mm approximately, 10.77g
Minor marks to the surface.
The thread hole for an alternative fitting has a soft solder, gold piece let in. Only visible from the back, and very small, approx. 2mm.
The lever catch is probably a replacement, c1930-1940.
No obvious chips or damage to the opals.
Sold for £1,200

Condition report:
Inscription to the guard of the inside curve.
A replacement catch, but still with some age c.1940-1950
The threaded tube to take a hair fitting has been sealed off.
Only very minor marks to the opals under 10x magnification - not worn or damaged.
Diamonds bright and lively.
Setting appears secure.