A grandmother fears for her grandson's life after his ring was found linked to a drug buy A RING belonging to a Rockhampton painter feared dead was being worn by another man who only returned it when confronted, his grandmother revealed. Sharron Garioch said she feared the worst for grandson Robert Martinez, describing his drug-related disappearance as if it was from the Underbelly series. The 26-year-old vanished with woman Chantal Barnett, 27, but has not contacted family or friends or used his bank account since leaving the family home in Rockhampton on March 1. Family said he left with $1000 in his wallet. His abandoned car was found at Gavial Creek about two weeks later, while the wallet was about 50m away. "I do think drugs are related," Ms Garioch, 63, told The Courier-Mail from her home in Red Cliffs, Victoria. Robert had a beautiful ring. Someone paid someone for drugs with Robert's ring. Ms Garioch said a man with the ring was questioned by another man as to why he was wearing it. "He said I got it from a bloke, I didn't get it off a Martinez," Ms Garioch said. The ring was returned to family and then handed to police and it is understood police have interviewed both men. Still coming to terms with her grandson's disappearance, Ms Garioch said she could not understand why anybody would want to hurt him. She said her grandson was "no angel" but would help anybody and felt he "walked in on something he shouldn't have got involved in." Ms Garioch said a watch belonging to Mr Martinez was still unaccounted for. "Until they find a body I will never give up hope," Ms Garioch said. It's the not knowing that kills you. If Robbie is deceased they should just tell somebody. Tell them where they are. At least that way we could bring them home and bury him. It is understood police have investigated links to the pair's involvement in drugs, including amphetamines and marijuana. Police have conducted more than 520 inquiries, with several crime sets established, including at homes of associates. Police divers, SES and general police have also searched areas, including Mount Morgan, south of Rockhampton. Crime Stoppers 1800 333 000.