I found this black Esterbrook transitional J pen with a 3 ribbed jewel and a bandless dollar pencil at the flea market today. It was very sunny out, and when I looked down at the top of the pen cap I saw that the jewel is a very deep translucent red. It looks almost black in normal light, but strong light penetrates the jewel and reflects back from the silver of the tassie. It's hard to photograph, but I am attaching a picture taken in sunlight. It reminds me of the deep red bakelite plastic used by Parker on some of its early pens, but could be something else. I have a few other 3 ribbed caps, but all of the jewels are definitely black. I tried to search for any other mention of this without success. Does anyone have information about these jewels?