Clockwise, from top: Martin Katz 18k white gold, amethyst,
tsavorite, black opal, and diamond ring; Tamsen Z 18k yellow gold, black
opal, and demantoid garnet ring; Kimberly McDonald 18k white gold, black
rhodium, black opal, and diamond ring; David Yurman platinum, black
opal, and diamond ring.
January 2012