Designed to accommodate a Marquise cut diamond (or tanzanite, etc, this 1980's surround will fit a stone that measures up to 8mm x 5mm, and a band up to 2mm.
From the appraisal:
- One lady's white gold wrap style band, stamped EREV 14K. - Weight 3.6 pennyweights - Contains 18 baguette cut diamonds, measuring 3.2mm in length, approximate weight 1.00 carat - Color G-H, Clarity VS1
It is a size 8.