Estate 18K Yellow Gold Invisible Set Ruby & Diamond Cocktail Ring — 2.28ctw

Metal: 18K yellow gold, stamped "18K"

Maker: Unidentified, marked "SG"

Rubies: 15 princess cut, invisible-set, approx. 1.80ctw; rich red, loupe clean

Diamonds: 6 princess cut, channel-set, est. 0.48ctw; F color, VS clarity

Ring Size: 6.5, slightly resizable

Weight: 8.6 grams

Circa: 1980s–1990s

Condition: Very good

Fifteen princess cut rubies fill the center of this 18K yellow gold ring in three unbroken rows. Because they are invisible-set, no metal interrupts the field of color. The rubies are a rich, saturated red and loupe clean, a notable standard for calibrated stones set edge to edge. Seen from beneath, the gallery shows the precise grid that holds each stone in place.

Two columns of channel-set princess cut diamonds flank the rubies, and their bright white gives crisp contrast to the red.

The European shank is flat-sided and squared at the base, which keeps the ring sitting centered on the finger. Its clean geometry matches the architectural lines of fine jewelry from the period.