Gold swings higher in frothy trading after biggest plunge in 7 years

· *Spot gold whipsawed on Wednesday, tumbling as much as 2.6% below $1,900 per ounce before erasing losses and gaining as much as 2% through the morning.*
· *The volatile session comes after gold sank the most in seven years on Tuesday.*
· *Rising Treasury yields "delivered a sledgehammer blow to precious metal markets" in...