scratch or crack in stone

[northerncindy]

Thanks for everyone's help! I found a stone the exact size that I need, so I will remove this one (maybe with a hammer!) and replace it. Thanks for all the advice and great ideas! I really appreciate it!
Cindy

[J Allison]

You could buy something like this and I could cut to size. To be honest it would probably work out quite expensive though. https://www.etsy.com/uk/listing/7391...search_click=1

[Dennis]

In summary, all the more radical ideas turn out to be expensive.

My favourite is Geoge's suggestion of filling in the defect with gold leaf (not gold foil)
On a pendant (and in a recess) it will not take much wear, so just size the crack using a fine brush, lightly burnish the leaf in place, allow to set over night, and rub off the surplus with a soft cloth.

A foil kit will cost about £10 including postage. https://www.ebay.co.uk/itm/164191897...t=pla-18164596
Dennis