Unmarked, but from my research this brooch is likely solid silver with a high-carat gold plating (and I have tested it for gold). This style is a'lovers knot', the entwined strands symbolise the two lovers lives becoming connected and unable to be pulled apart.
The stone is Montrose Agate, a lovely pale blue-grey. The brooch is quite three dimensional. It is antique (late Victorian), but is in very good condition with just a bit of wear commensurate with its age. Also, the pin appears to have been replaced, but it is obviously an old repair and doesn't detract from the brooch. A beautiful example of Scottish Victorian jewellery.
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This item is in the category "Jewellery & Watches\Vintage & Antique Jewellery\Brooches & Pins". The seller is "carousel_life" and is located in this country: GB. This item can be shipped to United Kingdom, Antigua and Barbuda, Austria, Belgium, Bulgaria, Croatia, Republic of, Cyprus, Czech Republic, Denmark, Estonia, Finland, France, Germany, Greece, Hungary, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Poland, Portugal, Romania, Slovakia, Slovenia, Spain, Sweden, Australia, United States, Bahrain, Canada, Japan, New Zealand, China, Israel, Hong Kong, Norway, Indonesia, Malaysia, Mexico, Singapore, Korea, South, Switzerland, Taiwan, Thailand, Bangladesh, Belize, Bermuda, Bolivia, Barbados, Brunei Darussalam, Cayman Islands, Dominica, Egypt, Guernsey, Gibraltar, Guadeloupe, Grenada, French Guiana, Iceland, Jersey, Jordan, Cambodia, Saint Kitts-Nevis, Saint Lucia, Liechtenstein, Sri Lanka, Macau, Monaco, Maldives, Montserrat, Martinique, Nicaragua, Oman, Pakistan, Paraguay, Reunion, Turks and Caicos Islands, Aruba, Saudi Arabia, South Africa, United Arab Emirates, Chile, Bahamas, Colombia, Costa Rica, Guatemala, Honduras, Jamaica, Kuwait, Panama, Philippines, Qatar, El Salvador, Trinidad and Tobago, Uruguay.