LOCUS (mathematics) 'a curve or other figure formed by all the points satisfying a particular equation of the relation between coordinates, or by a point, line, or surface moving according to mathematically defined conditions' Two small symmetrical shapes hang on a sterling silver curb chain and sit beautifully together. The circle measures 10mm and the semi circle measures 15mm. The sterling silver curb chain measures 46cm/18 inches and is approx 1mm wide. The shapes are a mix of brass and sterling silver (the circle is sterling silver) Your necklace will arrive in a Custom Made branded box. Designed and made in UK