What makes Austrian emeralds so rare and unique?

What makes Austrian emeralds so rare and unique?

A lot that stood out to me around the salerooms last week was this this pretty cluster ring. Sold at Woolley & Wallis and described as ‘An unusual emerald and diamond ring, late 19th century,’ this ring was set with a principal oval emerald cabochon and surrounded by cushion shaped diamonds.Accompanied by a certificate from Gemmological Certification Services, the emerald’s origin was stated as Austrian, with indications of moderate clarity enha…