My daughter really wants the pink and silver flowers and the butterfly pairs. Unfortunately, her ears aren't pierced so she's going to be waiting a while.
You can always make her some screwback earrings. I have a number of screwbacks since they used to be the standard in early 20th century, when most people's ears weren't pierced, and since they are adjustable, they are much more comfortable than than clip-ons.
I'd like to add to what Diane said - although silicone is always better for mold-making than polymer clay, depending on the pendant itself, liquid silicone may be better than putty-type silicone. Putty-type is not very good if you have smooth areas, since if air gets trapped while you are pressing the putty against the pendant, you end up with bubbles since they have nowhere to go. (If there are a lot of crevices, however, you can't really see the bubbles.) Putty-type is also usually more expensive per unit volume than liquid silicone. However, for many applications, putty type is easier to use since you don't need to make a mold box, like you do with liquid silicone.
Michael's carries a putty silicone, I think it's called Amazing Clay or something like that. It's not the highest quality, but with the coupon, it ends up really cheap, as far as silicones go. Since you are not coming back to Michael's any time soon, though, if you decide to order online, Oomoo 30 is a good starter liquid silicone. If you use a liquid silicone, you also need to make a mold box to contain the silicone while it's still liquid. I usually use foam core board for the bottom, but you can use corrugated cardboard as well. For the sides, sometimes I use regular cardboard e.g. from pasta boxes because it's easier to cut, and sometimes, foam board because it's smoother. And then, just hot glue them together, and you're set!
As long as you have good ventilation and a mask, you have nothing to worry about. I usually do it in a room with the door closed, window open, and a mask, and when I'm done casting, I leave the room for a few hours. (I usually do it before I leave the house to do other things.) I also have fans on the floor because resin fumes are heavier than air. I put my filled molds in shoeboxes and leave them to cure outside until the resin is set.
You don't need to change the filters on the mask every time - which is good, since the filters cost around $10. You need a filter rated for OV (organic vapors) for casting. As others mentioned, you also need to wear a mask when you're sanding, but you need a different filter since you need it to filter out particles, not vapors. I think the one that I have is P95 or P100. There are also combo filters that block both particles and vapors, but they cost twice as much - since they basically have the two layers sandwiched together - so since you don't need to block the particles and the vapors at the same time, the combo filters aren't best suited for resin casting. I imagine it's also more difficult to breathe with the combo filter than with a regular filter.
There isn't a good way to know if the filter is still working that I know of. However, to prolong filter life, take them off when not in use and store them in a ziplock bag. This way, they're not "filtering" anything that might be in the air, getting dusty, and so on.
I love that doll! The hair and the eyes and... must... make....!
I have a question. Since it's a translation of a Japanese book, does it explain things mostly in pictures? As in, can you figure it out (particularly the hair part) without the verbal explanations? I'm asking because I'm thinking of getting this book, but I know no Dutch, and Google Translate can do only so much! << it rhymes, it rhymes!
Wow! They are beautiful, but especially the first one! Are you making them for any special event?
How did you learn to do this? I've seen the video that's in Japanese, but if there's a book or something, I'd really like to have a read instead. I even tried looking on amazon.co.jp but I didn't find anything :\