Edwardian Aquamarine & Diamond Pendant

The pear shaped aquamarine is approximately 8.25 carats with a rose cut diamond cap which total approximately 0.20 carat This is suspended from a collet set old cut diamond which is approximately 0.25 carats. All set in platinum. The chain is a replacement 18 carat white gold chain circa 1970.
The length of the aquamarine and diamond drop is 1.1/2 inches (4 cms) The chain length is 18 inches (46 cms) and as a very secure clasp. Weight 5.48 grams