Program aims to educate young consumers about mined stones’ positive qualities.
More than half of items that sold beat their high estimates.
Gems linked to Austrian Habsburg dynasty make first appearance in nearly a century.
Bangle that Queen singer wore in “Bohemian Rhapsody” video among seven pieces that smashed estimates.
Top item is a marquise-shaped, 6.09-carat diamond ring with high estimate of $200,000.
Fancy-vivid pink diamond ring expected to fetch up to $200,000.