Not sure the age of this cross but I would say around the 1920s. It could be late Victorian up to a Victorian reproduction from the 1920s. The metals have been tested. The top is silver and the undercarriage is 14k solid gold. The piece weighs 18.5 grams and it measures 3 1/8" x 1 1/8" All diamonds are natural. Set in the center is a mine cut diamond. It measures 5.7 mm x 5.7 mm which makes it approx 1.00 cts. The grade is I1 and I color. The cross also holds 14 rose cuts, and 129 combination of round single cuts and European cuts. The total diamond weight is approx 3.65 cts.  Most of the small diamonds range from SI1 TO SI3. There is a loop at the top to accommodate a chain.