Vintage amethyst and diamond ring

Totally stunning vintage ring
Amethyst and diamonds, set in gold and silver.
Amethyst approx 12mm diameter, claw set on gold. To a surround of old cut diamonds, all grain set to silver foliage collets
Tested Stirling silver and 18ct gold.  Head 21mm diameter 
Weight 9.46g  finger size K-50
Price £1200