|Christie's New York Magnificent Jewels sale December 10, 2014
It's right on par with the pre-sale estimate which was between 4-6 million dollars.
The Golconda moniker describes diamonds devoid of nitrogen--an uncommon and highly desirable trait for a diamond. They are classified as Type IIA and coveted because nitrogen contributes a slight yellowish cast to diamonds. They also tend to be very clean stones. But Golconda is also a place; the Golconda Fort in India was the sole source of diamonds for thousands of years prior to their discovery in Brazil and South Africa.