18ct white gold aquamarine and diamond oval halo necklace the aquamarine collection by tivon features the celebrated aquamarine stone known for its stunning range of light sky blue colours to deep sea blue shades according to legends this magical gem originated in the treasure chests of mermaids and has since been regarded as the sailors lucky stone this enchanting tivon aquamarine pendant is a true statement piece that will distract every passer by it boasts an oval shaped 224ct aquamar