This is such a wonderful ring. It has more sparkle than most Georgian diamonds. It contains a large, center, pear shaped diamond, and seven smaller ones. The ring is set in 18 carat yellow gold (unmarked but tested), but the diamonds are set in silver, as they always were in this era. The diamonds have closed backed setting, and are foiled. The ring is circa 1800, and it appears to be a size 6 and 1/2. As so many of these old rings with closed backs, the front of the ring measures a little over a size 6 on the sizer, but when one turns the ring to the back, it measures 6 and 1/2. That seems to be the most accurate size, according to the way it fits my finger. The ring weighs 2.9 grams. Of course I can't give a carat weight of the ring without taking the diamond out of the setting, and we don't weigh rose cut diamonds the same way that we weigh modern ones, but the center stone is a good size, and I am guessing it is at least the size of a modern one carat stone, but that is a guess. The portion of the ring with the diamonds measure 1/2 inch North to South, and about 3/8 of an inch East to West. What is certain is that this is an amazing ring which is sure to be noticed. I love the pear shaped rose cuts; I have one already in my own collection, or I would have to keep this one.