The widest part of the brooch measures 9.7 mm. Apparently unhallmarked but we have tested it and guarantee it to be 18ct gold.
Fastening pin is also gold. The item "Pretty Vintage 18ct Gold, Ruby & Pearl Bar Brooch" is in sale since Friday, June 19, 2020. This item is in the category "Jewellery & Watches\Fine Jewellery\Fine Brooches & Pins\Diamonds & Gemstones".
The seller is "the_grynch" and is located in GLASGOW, Glasgow (City of). This item can be shipped worldwide.