"Silver" Double Heart Necklace

My father gave this to me when I was 10 years old and I loved it. However, many years later, I'm having a clearout of all my things. Any child receiving a gift like this will be chuffed to bits, no doubt.

I believe it's silver, but not sure as no expert on metals at all. The hearts are filled in a blue enamel. Length of necklace is 43 cms. Width of the heart design is 1.6 cms.

Will no doubt make a good Xmas gift at a bargain price !