Ivory Lane offers earrings for S$160 ($120) and necklaces for S$800 ($585), and insists its products are made from ivory that was obtained before 1990, when an international ban on the trade began.
It is still legal in Singapore to export and import products made from ivory sourced before the ban took effect.
The shop's Facebook page shows a picture of women wearing the items, with the message, "Ivory is a secret desire for most girls."
But consumers in the affluent city-state reacted with outrage, flooding the store's page with hundreds of angry comments and demanding its closure.
The demand for ivory, particularly in Asia, has contributed significantly to the decline in elephant populations worldwide.
Jason Baker, a spokesperson for campaign group People for the Ethical Treatment of Animals (PETA), questioned who would want to collect "fragments of a tortured, dead elephant."
In a statement issued Monday, Ivory Lane's owner Ivy Chng noted the "unhappiness" online but insisted that the ivory she was selling was "completely legal" in Singapore.