The suspects are accused of tying up the billionaire celebrity with zip ties and duct tape before making off with jewels, including a $US4 million ($A6.2 million) engagement ring given to her by her then-husband rapper Kanye West (now known as Ye), according to investigators.
Before Kardashian's testimony, her stylist Simone Harouche, who was asleep in the same luxury hotel flat at the time of the attack, spoke to the court on Tuesday morning.
"We've been friends since we were little girls. So when I heard this sound, it was very different, and it woke me up, because it was a sound that I had never heard from Kim. It was terror," Harouche, who was downstairs in the duplex flat, told the court.
"'I have babies, and I have to live' - that's what I heard her say," Harouche recalled on Tuesday, adding that she rushed to lock herself in the bathroom and texted Kardashian's sister Kourtney and their bodyguard for help.
When the robbers left and Kardashian joined her downstairs, "she was beside herself, I've never seen her like that before", Harouche said.
"She just was screaming and kept saying we need to get out of here, we need help, what are we going to do if they come back."
Yunice Abbas, 71, who is among the 10 suspects standing trial, many in their late 60s or 70s and dubbed "the grandpa gang", has told French media that he and others who took part in the robbery did not know who Kardashian was.
"It's not her, it's her diamond we targeted," Abbas told C8 TV a few years ago.
Abbas has admitted his participation in the robbery, and wrote a book about his role.
In interviews with French media, he said he was sorry for what he did and wanted to apologise to Kardashian.
Frank Berton, a lawyer representing 68-year-old Aomar Ait Khedache, said in April that he hoped that Kardashian being a global celebrity would not affect the trial.
Khedache is accused of being the gang's ringleader, which he denies.
In all, nine men and one woman are being tried by the criminal court.
Five of them - all men - face armed robbery and kidnapping charges and potentially risk being sentenced to life imprisonment.
The others are charged with complicity in the heist or the unauthorised possession of a weapon.
As the robbers escaped on foot or with bicycles, they lost some of the jewellery, including a cross with six diamonds, which a passerby found in the street and brought to the police.
But most of the jewels, including the $US4 million engagement ring, were never found.
As well as the 10 on trial, one suspect was too ill to be put on trial at this time and one was dead, prosecutors said.
