I have a 9ct gold gentlemans ring,large and heavy in weight,with what I can descibe best as a double ruler and patractor engraved on the flat square front of the ring,I presume it is a free masons ring? I was wondering if it was worth anything?

Not a great deal.
Check eBay for some ideas on value.

With gold prices so high it can have some value as scrap.
If you know the weight, you can call 866-239-4315 and they will buy it from you even if it is 9 karat gold.