This magnificent MacCallum Clan Crest signet ring by Scot Jewelry carries a tower and window and the proud MacCallum clan motto "In ardua tendit" which means "He has attempted difficult things". The rings with celtic triquetra designs on the sides taper more quickly than the wide-band rings, and are thinner at the back. These rings are popular for women and for men's pinkie rings. The name is spelled in a variety of ways including McCallum and Malcolm.