This DIY birthstone gift set is a quick & easy idea to make for anyone -- moms, sisters, daughters, BFFs, bridesmaids... It can easily be modified for non-pierced ears, or to use sterling silver findings instead of plated chain and ear wires.
10mm and 14mm Swarovski crystal hearts are available in all basic birthstone colors (see links at bottom).
The 7mm prong bail fits over a petite necklace chain and is a nice size for 14mm crystal hearts.
The 4mm prong bails with loops are nice for crystal earrings, because they are small an unobtrusive, and keep everything facing the right direction (no jump rings required).