The lovely horse tie bar above is a good example. Most of the jewelry was made in the late 1800's to early 1900's. It is also referred to as "Reverse Crystal Jewelry." A clear crystal is cut as a cabochon. A carving is made on the flat side like an intaglio, and painted wth a thin layer of mother of pearl to produce a three-dimensional effect. Like most everything, you'll find varying degrees of quality. But you will pay into the thousands for a nice piece. The more detail, the higher the price.
Here is a beautiful bracelet with a polo motif. This one is 14K and appears to be very good quality.
This one is Cartier. I can picture a lady in full sidesaddle attire wearing this as her stock pin.
This is 1910, a bit newer, probably not real gold:
Love these cufflinks, the detail is amazing.
Maybe your santa will go vintage this year!