Is this ring worth the price? https://www.ebay.com/itm/NATURAL-12-25-CT-GGL-CERTIFICATE-UNHEATED-EMERALD-RING-925-SILVER-SIZE-9-5-/273610106542?oid The seller seems trustworthy – 100% positive feedback. I am just surprised that such a big emerald is surrounded with simulated diamonds. And what about GGL? Is it a trustworthy lab? ...