I have an old ring that has been tested to be 14kt and platinum. There are no markings inside the ring except for a triangle that comprises 3 dots. Anyone know what that means?

The 3 dots in a triangle is the hall mark symbol, don't worry it's a genuine ring.

Triangle with three dots inside is similar to the chester hallmark symbol.

A shield with three wheat-sheaves around a sword

http://www.argentinglesi.com/uffici-importantiing.php

http://www.thebigworld.co.uk/rare_gold_and_silver_hallmarks.htm