White golden estate engagement ring

Some information:
  Style: estate jewelry.
  Material: 18K white gold.
  Diamonds: One treated fancy color diamond, marquise shape, with a weight of 0.93 crt and a clarity of VS1 (see also certificate with the pictures) and 22 modern brilliant cut diamonds with a total estimated weight of approx. 0.08 crt. Note: All diamond weights, color grades and clarity are approximate since the stones were not removed from their mounts to preserve the integrity of the setting.
  Total diamond weight: approx. 1.01 crt.
  Birthstones: Diamond is the birthstone (or month stone) for April.
  Hallmarks: English hallmarks.
  Dimensions: head of ring 1.45 cm (0.57 inch) x 0.87 cm (0.34 inch).
  Weight: 5.30 gram (3.41 dwt).
  Ring size Continental: 53 & 17 , Size US 6¼ , Size UK: M.
  Resizing: Free resizing, but because of the the way the ring is made, we cannot guarantee to make it on every size; so please ask in advance (only for extreme resizing we have to charge).

     An engagement ring is a finger ring of no generally accepted form that is given by a man to his fiancée as a token of marriage engagement, in the manner of the earlier betrothal ring, and indistinguishable in form or style. In recent years such rings have normally been set with a gemstone, usually a diamond (or any stone other than the ill-reputed opal), as a solitaire, of varying sizes, cuts, styles, and cost, but in the 19th century some were set with a pearl. In the same century the custom arose in England of separate engagement ring and wedding ring, and in very recent years such rings have sometimes been made en suite as a matching pair of similar style. In recent years, antique gemstone engagement rings are rapidly gaining in popularity.