The Church hall mark on this wonderful ring is very significant since they were an excellent maker of jewelry in the early 20th century. Church made jewelry for Tiffany & Co. with the Tiffany name. I have seen identical pieces signed Tiffany and Church and it is known that the Church company made pieces for Tiffany with the Tiffany stamp. Church used very fine stones and employed skilled jewelry makers. This setting is very well crafted, marked 14k and has the church hall mark for the company, a church. The 6 prong(not worn) set, genuine Australian opal, with great fire and color, is exceptional and gem quality, and not a doublet. The opal measures 3/16" wide and about 1/16" high. With the prongs/setting it measures about 3/16" high. This ring was well cared for by the former owners and is in excellent condition. It is remarkable to find a vintage ring as this with an opal so well preserved. The ring size is 5 3/4 to a 6. All in excellent condition. Perfect for that young lady(or older) that you want to spoil, or treat yourself! Very neat, elegant look with the clean cut lines. Satisfaction guaranteed or money back providing item returned in sent and packaged condition. Postage/insurance extra. New York buyer pays their local sales tax unless valid tax number and resale form provided.