A family member saw this spider in her garden in the Cape Town area of South Africa. It's very attractive and I wondered what species it was?
Approx size is that it would fit roughly on a 3cm diameter circle.
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Based on the location and image you provided, I suspect this spider to be Garden Orb-Weaver, belonging to the spider family Araneidae.
Just a side note: I used an app called iNaturalist to identify this spider. It is a helpful app to identify insects and plants.