A very attractive early 19th Century / Victorian Topaz and Turquoise set Brooch.
The 10 x 6 mm yellow topaz is mounted in a rub over collet sitting in a cut back Georgian type under bezel.
and is surrounded by 4  x 3mm and 4 x 2mm turquoise.
Dating from around 1830s this is a nice early hand made piece.
The pin is silver.

Length 23 mm
Width 20.7 mm
Weight 7 grams

Condition very good