Vintage 14 Karat Gold and Diamond Exclamation Point Pendant

This is a beautiful piece,  It is 14 karat yellow and white gold with 24 small diamonds in various sizes (around 1.1-2.2 mm) and one 3.92 mm diamond set in white gold.
The pendant is 5 mm wide by 25 mm long including the diamond drop.
The 14 karat yellow gold box/cobra chain is 16 inches in length. It has a beautiful locking clasp, also in 14 karat gold. The whole piece, including the chain and diamonds weighs 6.45 grams total weight.
Can't tell you the quality of the diamonds but have tested them and they are diamonds.