Sapreste distinguere la differenza fra un gioiello di scena o un diamante vero?

Would you be able to tell the difference between costume jewellery and a real diamond? A diamond ring bought for £10 at a car-boot sale 30 years ago is expected to fetch £350,000 at auction. The owner believed the "exceptionally sized" stone was a piece of costume jewellery when she bought it at West Middlesex Hospital [...]