14K White Gold Plated Sterling Silver Pendant With Natural Diamond

Sterling silver pendant with deep blue gemstone and one small natural Earth mined diamond. In excellent condition. Stamped 925 and also has a makers mark MHJ (Michael Hill Jewelry). Plated with 14K white gold, so won't tarnish. 1.6 cm long. The diamond is on the left side of the pendant, securely prong set, and was professionally tested. Not sure what the blue stone is. It tested as a real gemstone and looks like either a Tanzanite, or a Sapphire. But this is only my guess.