Mr Freeze values a gemstone that could be worth more than a million pounds.
Gok welcomes Gina and Oskar, who move jewellery maker Nikki to tears.
Kiran has to use all his skill to make a new wedding band for Maria and Lee.
Chris has a tricky fix on his hands with an engagement ring.
Gok hears the story of a necklace that arrived in the UK with a Czech family fleeing war.
Gok Wan can't believe his eyes when jewels fit for royalty make their way to the store.
Gok Wan welcomes Jess who needs a tricky transformation on an heirloom.