You say on your site

The demi-parure consists of:

a necklace
a brooch - fermoir (ehemals Schliesse)
a stomacher- -In the girandole style corsage ornamet - originally having three pendant drops, two of wich in modern times have been reworked ass earrings- see picture above) is an element of the Emire style. the large triangular dimond with branches of laurel in diamonds on either side, reminiscent of Roman chaplets.

Are you saying that the top Topaz cluster element was originally the formoir and the stomacher was originally topped by the diamond?