This is a classic ladies Sterling Silver & Amethyst Celtic brooch that I think is 60-80 years old? 

Its just marked "Silver" so it could possibly be an Isle of Iona Brooch going of the quality and heavy construction and the use of a Specimen Stone? if not from the islands its probably Scottish made in some capacity.

Made in the strong classic Celtic manor, its heavy and solid with a wonderful high grade lilac / pale Purple Amethyst Stone, found in an old estate, just a great original item that would be just the ticket once its been cleaned up and polished.

Good condition but a little dirty and now possibly needs a good clean up and polish before wearing.

Sold as 100% Sterling Silver & Amethyst vintage item.

Size: Approx 3.6 cm across.

Any questions please ask.