Platinum Natural Diamond Solitaire With Diamond Halo & Shoulders Engagement Ring by Chisholm Hunter. Features a round white diamond with a total carat weight of 0.55. The diamond has excellent cut grade and Slightly Included (SI1) clarity grade. Crafted in 950 platinum, the ring is hallmarked and set in a halo style in ring size K. Only worn for roughly six months and professionally polished at Chisholm Hunter, can be resized to either J or L if needed, in excellent condition. Selling this ring as my husband and I have purchased another recently.