Three-Stone Gold and Platinum Engagement Ring with a GIA 1.13 Carat Old Mine Cut Diamond Center

Period: c. mid-late 1900s; Victorian Revival; European origin; the center diamond was likely cut in the mid-late 1800s Stamps: the ring bears a sideways anchor, which is an assay stamp from Birmingham, England. It is also stamped with 18CT, PT, and 585. There is an additional mark of F B S in a triangular “cat’s paw” pattern, though thus far we have been unable to identify the stamp.  Materials: 18K and 14K faint green gold; platinum Dimensions: approx. 6.30 mm wide north-to-south across the top; the ring stands 5.28 mm tall above the finger Size: a hair shy of 3 3/4 (free sizing up to a US 7) Diamonds:      Center: GIA assessed 1.13 carat Old Mine Cut diamond with K color and SI2 clarity      Sides: two Transitional Cut diamonds (.35-.40 ctw., est.) with approx. G color and I1-I2 clarity   Item Q3531SUNT