Rock Couture Collection 9ct Yellow Gold Ring Decorated With A White Cubic Zirconia Stone. Signet rings are back in fashion. Formally known as the "Gentleman's ring" they go way back to the old testament. Traditionally worn on the pinkie finger, the signet ring often bore an engraving of the family crest or an initial. But as with most things that started with men, us gals are claiming them for our own and they've become the latest addition to everyone's bling wishlist! This ring is 8mm diameter.