This large, sparkling brooch is a common style in historical jewelry.  A large central stone (measures 25mm long) is ringed by two rows of sparkling Swarovski crystals. 

This is a large brooch that measures 2" long!  

This is shown here in ruby red but is available in many different colors.  See the last image for the available colors for the center stone.  

(The brooch shown in that listing is available here: )