Antique Miniature Portrait of a Noble buying Lady

This antique miniature portrait of a young lady was done in the 18th or 19th C. The exquisite detail to the picture is amazing. The artist has done an incredible job capturing the lace to her collar, her jewelry, and the young innocence of her face. Although dressed as a mature lady it is likely that she is only 14 years of age. The jewelry and dress would suggest that she comes from royalty or a very wealthy family. There is a signature near her left shoulder and it appears to read 'Dyck' and buying the costume would suggest 18th C.. The painting is on a wafer not card. The piece is housed in an antique frame with convex glass and a bronze collar around the glass. It measures 4.5 x 5.5 inches. The quality and detail of the entire piece is truly breathtaking.