Ariarne Titmus wins her second Olympic gold medal and gets her own Australia Post stamp

Good as Gold: Ariarne Titmus was honoured with an Australia Post stamp to mark her gold medal in the 400-metre freestyle.

Good as Gold: Ariarne Titmus was honoured with an Australia Post stamp to mark her gold medal in the 400-metre freestyle.

What a rush! A gold rush, in fact.

Watching Ariarne Titmus pull off a breathtaking swim to overcome Hong Kong's Siobhan Haughey in the 200-metre freestyle had us yelling wildly in our lounge room. We probably scared the neighbours.

Her dad Steve said what we were all thinking: "What an incredible comeback".

Mum Robyn added: "She always comes home strong. Honestly, we were nearly having a heart attack".

Ian Thorpe, commentating for Channel 7, admitted he was "concerned how far she was behind" at the 100-metre mark.

Co-commentator Leisel Jones was more confident, saying it was all about "trusting the process".

"Stick to the plan, execute," the matter-of-fact Jones said.

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Jones kept her emotions in tact, then cheekily called out Thorpey for tearing up.

"I don't mind crying for Ariarne," he said, no doubt recalling his own glories in the 200-metre freestyle.

Even the voice of head commentator Basil Zempilas could be heard quivering.

Earlier in the day, Australia Post honoured Titmus with a stamp to mark her maiden gold medal, having beaten US champion Katie Ledecky in the 400-metre freestyle.

Fellow Olympians Bronte Campbell, Meg Harris, Emma McKeon and Cate Campbell also received a stamp for their gold in the women's 4 x 100 metre relay.

Every Australian gold medal performance in Tokyo will be recognised with a gold medal stamp.

Australia's golden relay girls on a stamp.

Australia's golden relay girls on a stamp.