My grandfather passed this down to my dad who has just passed it down to me and it's a large stone. Dad says it's "synthetic" and the ring has some hallmarks I can't make out yet. I wouldn't know where to begin finding it's value but thought I would start here. Is there any jeweler in Honolulu who can help appraise this ring? TIA
![synth_diamond_2.jpg synth_diamond_2.jpg](https://www.pricescope.com/community/data/attachments/412/412837-ccf3f9b9553fe5c0d873102ebb6ce17a.jpg)
![synthetic_diamond.jpg synthetic_diamond.jpg](https://www.pricescope.com/community/data/attachments/412/412836-165c420cb82dfe096db9f66f055bc991.jpg)
![synth_diamond_2.jpg synth_diamond_2.jpg](https://www.pricescope.com/community/data/attachments/412/412837-ccf3f9b9553fe5c0d873102ebb6ce17a.jpg)