Thank you for taking the time to read my post and hopefully someone out there can conclude this mystery. These Earrings were my Grandmothers Great Aunt's so at least 6 generations down the line to today, they seem to be of very soft gold (marks easily), a crown of sorts holding what I believe is jade or possibly emerald the stone is a dark green but gets a pale translucent look in decent lighting, the only hallmark they have is a 3 and a 0 on the underside. having looked elsewhere I can only find information on hallmarks that include symbols or letters, or the standard K inscriptions. From oral history these ladies spent a lot of time in Europe, India and Singapore, possibly even Canada, the family ethnic origin would of been northern European. I have included two images below not in the best lighting, I can provide better pictures if this is required (sorry they are a little fuzzy)
