Stacking rings yellow- and red gold

Both rings are a one of a kind ring with zircon. The gemstone zircon is a natural gem (not te be confused with the synthetic version, which is called zirconia). The zircon has a very high gloss and intense fire. The yellow-red to brown variety is also called Hyacinth. The yellow gold ring comes in size 17 (53,5) and is a tiny bit adjustable. The size of the stone with setting is 5,5mm. The width is 1mm, height is 2mm, flat surface. The red gold version comes in size 17,5 (55) and is a tiny bit adjustable. The size of the stone with setting is 6,5 mm. The width is 1mm, height is 2mm, flat surface.