Thank you so much JR76. I am always interested in working out how jewels are constructed, and bore people endlessly with questions.

I can make out (I think) the spring under the central diamond and the loop for wearing the central section as a pendant. I am still trying to figure out precisely how all the sections join. What an interesting time I will have today! I presume that is the marker's name, plus symbols for gold etc that I can see under the larger diamond in the upper left hand corner, and that the additional hair and brooch fittings screw in.

What an incredibly versatile jewel!