I can't say enough about this museum piece. It's a Stuart Crystal, Heart Shaped, with the CR scribe and crown in gold thread, sitting on a bed of blue silk. It has a basket back, and beautifully chased shank., which amazingly, still has vestiges of its black enameling. It weighs 2 grams. The ring is in amazing condition, and it is circa 1660-1690, of the period just after the execution of England's Stuart King, Charles I. Those of you who buy and collect mourning jewelry know that the Charles pieces are the Cadillac of mourning jewelry, and they command large sums. I went into a shop in London that specializes in fine antique jewelry. I walked right up to the booth of some ladies from whom I often buy, and the first thing I saw was this ring. No on pointed it out to me; I just saw it and was attracted to it because it is heart shaped. Imagine my amazement when I saw he scribe, CR. My friends laughed at me, saying "We knew you'd go for that." It should fit my finger and I believe it did in December, when I bought it but this is almost June, and it won't go over the knuckle of my ring finger without wetting my finger, and I don't want to apply too much pressure on gold that is high carat and 300 years old. I could easily wear it on a chain. It is much too large for my little finger. Anyway, I have had it in my own things since buying it in December. I would be most happy to keep it, but I have kept far too much, and I have other Charles pieces in my collection. I will list it now, for a time, with regret. These pieces are not easy to find, outside of museums, and they are never cheap, but this one was reasonable, I think, for what it is.