Vintage sapphire blue crystal cluster design brooch and screw back earrings with rhinestones set open-backed in silver tone

Beautiful delicate vintage blue crystal brooch and screw back earrings. Numerous lovely quality bright sapphire blue rhinestones are claw / prong set open-backed in shiny silver tone. The quality and colour of the rhinestones is outstanding and the design is delicate and detailed.

The pieces are similar in construction to others I have listed and so my best guess is that it was made in around the 1930s because of Art Deco features. The silver tone does have the feel of rhodium plate which was used in Art Deco pieces through the 1930s. However I am very willing to be corrected if anyone can message me with more knowledge of jewellery of this type. The pieces are in very good vintage condition.