Gemstone Bay is on the way to Cathedral Cove. It is a tiny, rocky bay without a beach. The descent to it is from the Cathedral Cove coastal path. It is well known locally as being good for snorkelling. If you zoom in on the satellite view you can see the path that continues to Cathedral Cove itself.

Gemstone Bay - Coromandel Peninsula visitor guide showing a virtual tour of 'Gemstone Bay' linked to an interactive map with local and travel information. 360° panoramas from Waikato.

Gemstone Bay is part of the Te Whanganui-A-Hei marine reserve in Coromandel to Hahei. It is the first of three coves passed on the walk to Cathedral Cove. Gemstone Bay is about 15 minutes walk from the carpark near Hahei. This is a rocky cove without a beach, used mainly for snorkelling. The next bay along is Stingray Bay where, as the name suggests, you may be able to see stingrays in the water.

Walk: Walk from the Cathedral Cove Lookout and car park at the end of Grange Road near Hahei. Also accessible by sea kyak and boat.
Car: The car park is 1.3km from central Hahei. Hahei is 73km northeast of Thames and 78km from Coromandel