An emerald and diamond three stone ring
An emerald and diamond three stone ring, the octagonal-cut emerald weighing 2.44 carats accompanied by GCS Report 79233-46 stating to be of Colombian origin, set between two Peruzzi-cut diamonds weighing 1.02 and 1.08 carats, all mounted in platinum openwork collets with heart-shaped decorations, to D-section shank, gross weight 6.4 grams, SHRV.
Peruzzi-cut diamond: The first brilliant cuts were introduced in the middle of the 17th century, known as Mazarins, they had 17 facets on the crown (upper half). In 1681 Vincent Peruzzi, a Venetian polisher, increased the number of crown facets from 17 to 33 (known as triple-cut or Peruzzi brilliants), significantly increasing the fire and brilliance of the cut gem. Because the practice of bruting had not yet been developed, these early brilliants were all rounded squares or rectangles in cross-section (rather than circular). The cushion-cut diamonds known to us today as Old Mine Cuts were introduced in the early 18th Century.