In order to reduce lag, we've put some restrictions on what vendors can have rezzed in their booth. Note that these rules apply only to what you have rezzed -- your actual jewelry (unless you've set out a model of it) can have as many prims, textures, and particles as you like.

1. Regular booths are limited to 30 prims, except for sponsors.
2. Regular booths are limited to 1,966,080 total pixels. (That's equivalent to 30 256 x 256 textures.) The size of each individual texture doesn't matter; what's important is that all of them, taken together, have fewer than 1,966,080 pixels. (Like the prim limit, this is higher for sponsors.) Note: this applies to people with vendors, too -- the number of pixels in all your vendor textures needs to be at or below your limit.
3. Tip: To calculate the number of pixels in an image, multiply the number of pixels it is high by the number of pixels it is wide. Note that Second Life only accepts textures with sides of 32, 64, 128, 256, or 1024 (and possibly 2048) pixels; anything else will be resized to one of those numbers. Second Life does not, however, demand that textures be square: 32 x 256 is just as valid a texture size as 256 x 256.
4. Boxes and cylinders only.
5. No lights.
6. No flexiprims.
7. No physical objects.
8. No megaprims.
9. No sculpted prims.
10. No particles.
11. No temp rezzers or 3D vendors.
12. No moving objects.
13. No animated textures.
14. Please keep hovertext to a minimum, and don't let any hovertext you do use constantly intrude on your neighbors' booths.
15. Please also keep scripts with open listens and timers to a minimum.