When Krish Himmatramka was working as an engineer in the oil industry, he would spend his spare time in his trailer in northern Louisiana scouring the Internet for the perfect engagement ring for his girlfriend. But he struggled to find one that was ethically and sustainably produced. After researching the jewellery industry, he decided to quit his job and start the brand Do Amore, which means “I give with love” in Latin. His girlfriend’s ring – structured with recycled rose gold …