green diamond

If there are no Pricescope vendors, I would call your insurance agency and ask for a referral to an independent appraiser.  The appraiser may be able to give you some idea where to sell it.  If it is an heriloom diamond, are you sure you want to sell it?

if its natural color an auction house may be the best bet depending on how deep the color is.

here''s a link to apprasiers in TX. You can enter your zip and hopefully someone close by will pop up.

We would love to see a pic.

I set up an appointment to get it appraised, (thanks for appraisal links)  then I''ll post all info and a pic for anyone interested in taking a look.  Should be fun.

1) Get a GIA report enphatic in color grade ( green unfortunately are the most  easy to get  artificial HPHT or irradiate , even before  early 40''s). They are 3 possible grades that can be combined one with anothers , it means you have at least  6 possible kinds of colors hues... they came from amazing expensive to relative cheapest ones , but because the size of the stone you ever cold get a good deal....
2) Once youre sure  the stone is a natural colored diamond , you will need to proceed  for a action or to tryTto deal directly  with Harry Winston ( they are commonly interesting in  big  colored stone like you have , of course , if they are natural.
3) Dubai Diamond merchants ( United Arab Emirates) could be an exellent  place to sell it , and the money will not a big issue.. 
4) I can tell you that this stone only cold be mined mainly  from Brasil, Venezuela, British Guyana, Cote d Ivory, Sierra Leone or Ghana. If you know this stone came from another origin , you will  take double chek it....
5) You could expect to have an authentic tresure...... when try to trade the stone ,  pls  go step by step... try to looking 4 a reputable teller...... Diamonds  can rise 500% their value if are properly trade 4 reputable DIAMANTAIRES...TRY WITH OLDMINER......, BUT IF YORE NOT AN VERY SEASONED DIAMANTAIRE,  PLS , DO NOT TRY TO SELL  ALONE ( WITOUT  EXPERT ADVICE) THIS STONE,  OR  CERTAINLY THE  ONLY YOU WILL BE  GET IS  A BAD BUSINESS TO YOU... AND LOTS OF MONEY TO ANOTHER....

   Hoping  u  very good look....