Giordano, who is not charged with any crime, is being held until this weekend, when he will again go before a judge. In Aruba a judge can order him held for another eight days. Giordano's lawyer in Aruba, Michael Lopez, did not return calls for comment.
Gardner's brother has started a Facebook page -- "Help Find Robyn Colson-Gardner: Missing in Aruba" -- which includes a description and pictures of the 5-foot-5, 130-pound blond, along with updates on the efforts to find his sister.
"I'm hoping to raise awareness," Colson said. "I'm just hoping we find Robyn, and that the truth becomes relevant, and the rumors and false information stop being spread."
"She was very determined and worked hard at her personal goals. When I was 10 or 11, she told me to always live my life like today is my last day, and that was a strong influence on me," Colson said.
In 2005, Alabama high school senior Natalee Holloway disappeared in the same town while on a senior class trip with her school. She was never found. Holloway's family publicly criticized Aruba police for the investigation into Natalee's death.