where do i go to sell a few quality vvs-AAAblue burma sapphires 4.6ct oval & 8.2ct.round realy beautiful-clean stones....& a couple of burma rubys 4.6ct pear very transparent & 6.4ct oval very transparent &RED they have the typical slight inclusions one might expect in larger ctw. sizes.some fellow collectors consider thes to be world class....im a private collector of 30+ years & have had some serious med problems of late and am needing to convert to cash .who buys these this day and age &what are there values,or offers???how does it work????ANY IDEAS????