do non swarovski cyrstal headpieces...

show up as black in pictures? My friend is getting married and she asked me, adn I never heard that before but someone told her that. My dress and headpiece was real swarovski so I am not sure. Can you please help? tia

I don't think any crystal would show up black in a photo, even an acrylic stone would reflect some light. Here is a little bit about how rhinestones are graded:

Rhinestone Quality/Grades
Swarovski® Austrian Cut-Crystal Rhinestones are absolutely the finest stones available, and are the standard against which all other rhinestones are judged.

Czech (and some Asian) Cut-Crystal stones are very close in quality to Swarovski® Austrian Cut-Crystal stones, and are typically a little cheaper.

Molded 'crystal' Stones - many Czech and Asian 'crystal' stones are actually molded to shape rather than cut, and this degrades the quality of the stone quite a bit.

Glass stones may be either cut or molded. Cut glass stones are probably somewhat higher-quality than molded 'crystal' stones, but lesser-quality than cut 'crystal' stones. Molded glass stones are typically lower quality than molded 'crystal' stones.

Acrylic stones are molded plastic.