Edinburgh Zoo-based scientists made the unusual discovery as part of a project using genetic analysis in a bid to tackle wildlife crime.
DNA from samples of ivory can be used to identify poaching hotspots, and in their Cambodian work the team identified many samples from Asian and African elephants – species that are being wiped out by hunting and habitat loss.
The woolly mammoth, on the other hand, is not protected as the species was driven to extinction thousands of years ago.
“It was a surprise for us to find trinkets made from woolly mammoth ivory in circulation, especially so early into our testing and in a tropical country like Cambodia,” said Dr Alex Ball, who runs the WildGenes project.
“It is very hard to say what the implications of this finding are for existing elephant populations; however, we plan to continue our research and will use genetics to work out where it has come from.”
The multibillion-pound trade in ivory is responsible for the deaths of up to 30,000 elephants every year, and DNA extracted from illegal shipments has already been used to bring major criminal gang members to justice.
Tusk DNA can not only reveal important information about individual elephants, it can also be compared to genetic maps of the species to find where it originated.
Dr Ball said ivory sales were on the rise in Cambodia, but there seemed to be no evidence to suggest the nation’s own elephant populations were being poached.
“Understanding where the ivory is coming from is vital for enforcement agencies looking to block illegal trade routes,” he said.
“If we can use genetics to identify where elephants are being killed for their ivory, measures can be taken to protect those most at risk of persecution.”
The researchers in Scotland are working with local scientists to establish a conservation genetics laboratory in the Cambodian capital of Phnom Penh.
“We are working with partners in Cambodia to support and train staff, which will enable them to carry out more of this work, which is vital to conservation efforts,” said Dr Bell.
The effort is partly funded by the UK government, and comes after ministers announced last year “one of the world’s toughest bans on ivory sales” to protect elephants.
Under new rules, only a small selection of items including certain antiques and musical instruments will be allowed to be sold if they contain any ivory.
The EU meanwhile has faced criticism for holding back on measures to further limit the trade in ivory within its nations.
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