Customised Engagement Rings, Wedding Rings & Lab-Grown Diamond Jewellery in Malaysia & Singapore. ROMAN & CO. is a bespoke jewellery studio with showrooms in Johor Bahru and Kuala Lumpur, specialising in custom engagement rings, wedding rings, wedding bands, lab-grown diamond rings, natural diamond rings, and fine diamond jewellery for clients across Malaysia and Singapore. Every piece is crafted with certified natural diamonds, lab-grown diamonds, 18K gold, or platinum through our family-owned jewellery workshop in Batu Pahat, allowing us to offer a personal custom-made experience and a faster turnaround — with most bespoke rings completed in as fast as 10 working days.