Some quick info to value Gold Filled jewelry, watch cases and eye glass frames.
Gold filled markings look like this:
1/10 10K GF (1/10 is 10% gold by total weight)
1/20 12K GF (1/20 is 5% gold by total weight)
1/10 12K GF
1/20 14K GF
1/10 14K GF
Time for some math
You have a 5 gram total weight 1/20 12K GF pendant:
5g (pedant) x 5% (1/20th of total weight) = 0.25g x .500 fine (12K gold) = 0.125 grams AGW
You have a 24 gram total weight 1/10 14K GF watch case:
24g (watch case) x 10% (1/10th of total weight) = 2.4g x .583 fine (14K gold) = 1.399 grams AGW
Avoid HGE, HGP or RGP markings.