Courtesy: Jan Goodman Co Ruby can command the highest prices of any colored gemstone. The per-carat prices of fine-quality rubies have been rising consistently, many times breaking auction records.

Courtesy: Jan Goodman Co Ruby can command the highest prices of any colored gemstone. The per-carat prices of fine-quality rubies have been rising consistently, many times breaking auction records.

Gemfields sold 143,613 carats of rubies at an average price of $322 per carat, up from $317 per carat at the previous series of ruby auctions in June. The figure is the highest average price per carat ...