The photos form part of the description. This is made in Italy, Florence, therefore is 18K. Italian made gold must be no less than 18K. It is hallmarked "750" but it doesn't come up in the photo well - 750 means 75%, which is 18K ie "18k of 24k".
I will include a certificate of authenticity. The coin is two sided.
The current side is an illustration of three figures. The hidden side is of the "cameo" style roman head. You can see the outline of the head in one of the photos. Either side is suitable as the "show" side. But I preferred the three figures.The coin is certified as "Costantino II 337-340" This is "Constantine II" Apparently, this coin was found in a chest of treasure buried beneath the floor of a church. It was discovered when repairs were recently carried out on the church. The ring with the coin is 16 grams exactly. The size is "Y1/2" or "12 1/4" This is a big, manly ring. As this is a precious item I reserve the right to exclude buyers with little or poor feedback. The item "18K Gold Ring Ancient Coin Constantine II 337-340 made in Italy SACCARDI" is in sale since Sunday, July 03, 2016. This item is in the category "Jewellery & Watches\Fine Jewellery\Rings".
The seller is "bambooleafgreen" and is located in Belgrave, Victoria. This item can be shipped to Australia, to United States, to United Kingdom, to Japan, to Canada, to Germany, to France, to New Zealand.