Starting at 22:10, the Granada dramatization references Fragonard.  Do they mean Jean-Honoré Fragonard the painter?  If you read the story, Doyle does not name anybody, only that it came from Spain and Fragonard came from France.  I did find the sketchbook designs of jewelry a nice touch though.

Read the story here

What the original story says about the jewelry, a plot point that drives the whole mystery:

“Lady Frances,” he continued, “is the sole survivor of the direct family of the late Earl of Rufton. The estates went, as you may remember, in the male line. She was left with limited means, but with some very remarkable old Spanish jewellery of silver and curiously cut diamonds to which she was fondly attached–too attached, for she refused to leave them with her banker and always carried them about with her. A rather pathetic figure, the Lady Frances, a beautiful woman, still in fresh middle age, and yet, by a strange change, the last derelict of what only twenty years ago was a goodly fleet.”