RAPAPORT... The American Gem Trade Association (AGTA) alerted the trade to four missing cabochon Burmese rubies following the JCK Vegas show. The stones were part of Jack Abraham's The Precious Collection's inventory.
The carat weights are 5.89 carats, 8.99 carats, 12.39 carats and 15.79 carats. AGTA has posted images and the certificates (here) and asked the trade to be extra vigilant if someone attempts to sell rubies matching these descriptions.