Estate American invisible set princess cut diamond ring, circa 1990. This substantial 14 karat white gold ring features a raised center square of invisible set princess cut diamonds with seven rows of seven diamonds, along with 20 more princess cut diamonds below and one row of single cut diamonds as well. This ring has 1.75 carats total weight of diamonds with VS1-SI1 clarity and F-G color. This invisible set diamond ring is a size 6.25 and weighs 12.4 grams.