If it were my money, i would :
1. Run it through an ASET
2. Request a Sarin or Helium Scan
3. Run the numbers through the HCA
4. If you like the numbers look over it in person, if you''re happy with it, purchase the stone. You can get all the idealscope images, ASET images, and scans in the world, but if it doesn''t sing to your eyes with fire, brillance, and scintillation in person, don''t buy the stone. There are stones that don''t look good on paper, but look awesome in person. Call the stone in for personal scrutiny.
5. Send it to an appraiser who isn''t affilated with a store that sells stones (independent appraiser). I hear Richard Sherwood is awesome, also Roc Doc. If he conclude it''s a good stone and looks good to your eyes, IT''S A KEEPER. CHERRY PICK YOUR STONES. Scans, HCA, ASET, And etc. are all tools meant to weed the the duds form the superstars. Your eye will be the final judge. trust me on this.