This rare exquisite jasperware button was found, shankless, in a 14 karat gold brooch. We can't see the mark, but it is surely Wedgwood (I have since found this medallion with the old Wedgwood mark). It measures 1 & 3/8 inches. I had the shank replaced with one from exactly the same time period (see back photo of another 18th c. pearl). The jasperware has some flaws in the firing, but these do not detract from its rarity or value. Wedgwood had numerous problems in developing his now famous jasperware. The split at the neck of the subject is the most common type. The inner border is gilded copper. I love the snake...better than a bracelet.