check out this link – http://www.mfa.gov.il/MFA/MFAArchive/1990_1999/1999/2/King%20Solomon-s%20Seal
seems that the 6 pointed star has been found as far back as the 3rd/4th centuries. I think that predates Karites by a couple hundred years minimum. They may have embraced the symbol as well…but whatever the origin, it seems to be older.