1920's Old European Diamond Choker Antique-current Appraisal attached

Great gift for Christmas! This is a beautiful Old European Diamond Antique Choker necklace and has been recently appraised by a very reputable jeweler in Portland that you can verify on web. Appraised at $8000 last December and gold prices have risen 50% since then, so value now around $8700, asking $6600. All the information and value is in the appraisal, and will be provided. It is from the Crane family in Philadelphia, that is all I know of the history. I would like to sell before Christmas. I read that these particular type of diamonds are trending on Instagram because they are so unique, and this increases the value because they basically cannot be replaced. It really seems to shine more than other jewelry I have seen and is a conversation piece and gets noticed.