Out of South AfricaWho better to introduce a gold ­jewelry line with a transparent chain of custody than a refiner and manufacturer from the same country? That’s what Cape Town, South Africa–based manufacturer ­OroAfrica had in mind when it debuted its Certified Responsible Gold line of Absolute wedding bands with gold sourced from Germiston, South Africa’s 92-year-old Rand Refinery.The 68-year-old OroAfrica introduced Rand metal bands two years ago, garnering five South African stockists. In 2012, it reached out to the European market at the VicenzaOro Winter fair. Now, the firm is co