10k refers to ten karats of gold, almost certainly the cheapest gold alloy used in jewellery. It involves the minimum quantity of gold, therefore appearing as pale yellow in shade. HK is actually a trademark that means Harriet Kelsall. They style and design and supply jewellery all around the UK https://gunnerqziry.suomiblog.com/jp88-things-to-know-before-you-buy-52497169