One of the issues with these stones is that they don’t have traditional jewelry proportions and therefore a custom mounting is necessary…so that devalues them a little and I forgot to add that. Two well known and very expert recutters are Wayne Emery and Anthony Lloyd-Rees (the Stone Doctor). Either of them could offer you an estimate and an opinion if you sent the face up picture you shared here.
If you tilt this stone, rotating along its long axis, you will see the middle facets window as the angle gets too shallow for light return (this happens with all stones below a very high RI if the tilt is enough) and you will see the edge facets begin returning light as their angle to the light going into the stone gets to about 35 degrees. At about 35 to 45 degrees the pavilion facets will return light when the stone is face up, but beyond that, probably not. Someone has bellied this stone to save weight, but, in the process has not maximized the light return. Just look at some other emerald or rectangular cut stones for sale on the Net and you will see some which have good color across the whole stone. whiereas you have a light (good) color stripe across yours in the middle, with dark color on either side amounting to over half of the stone.
Good luck with this project…I’m sure your wife will enjoy the stone. I love tourmaline…so many wonderful colors!