'Diamond in the Rough', The phrase is a metaphor for the original unpolished state of diamond gemstones, especially those that have the potential to become high quality jewels. It is more commonly expressed in the form 'rough diamond'.
There's an enduring sense of cool associated with nautical style, and OTAA's Diamond in the Rough cufflinks excels at distilling the look. This cufflink is subtly detailed blue gem in the center, and has been crafted from rhodium for a sense of refined polish.