BERRICLE Rhodium Plated Sterling Silver Halo Promise Engagement Ring Set Set w/Swarovski Zirconia Round METAL: rhodium plated silver, stamped 925, high polished finish, nickel free. RING BAND WIDTH: 3mm. PREMIUM QUALITY STONE: Main Stone: 0.46 carat round cut clear Swarovski zirconia (5mm) STYLE: This 2 piece halo ring set's simple elegance and infinite brilliance are what makes this set so special. STYLE: Petite - This ring is dainty with small carat weight. Engagement - Ideal for engagement, this ring will be perfect for your special one. Promise - Sweet and sparkling, this style is an ideal promise ring for your girlfriend.