NGC Blog :: bonhams auction :: National Gemstone

A 18.17 Mahenge, Tanzania Red Spinel sold for $630,375 or almost $35,000 per carat.

May 18, 2022, 10:22 AM

Although not as expensive as the famous pink Hope Spinel (sold for $1.5 million in 2015), the 18.17 sold for more on a per carat basis.

An oval 3.21 unheated Burma ruby sells for $150, 514 per carat or $483,153 at Bonham's Hong Kong Jewels, June 20, 2021.

Jul 8, 2021, 8:31 AM

It was mounted in a signed Van Cleef & Arpels 18K gold ring with 1.40 of small diamonds.

Pink Burma Ruby and Diamond Ring in Platinum, circa 1900, sells at Bonhams for over $18,000 per carat

Feb 17, 2021, 10:50 AM

The antique cushion ruby weighs approximately 1.95 and has rose cut diamonds weighing approximately 0.70ct. mounted in platinum