Nikki - you don't have to take it to a jewellers. I can tell you categorically that it has a window. I was trying not to be too blunt and skirt round the edges.
HOWEVER one thing you MUST know. I doubt whether many jewellers have seen Alexandrite. I've been collecting it for many years and have a fairly large collection. When I first started collecting, nobody I knew, jewellers etc., had seen it. A normal high street jeweller wouldn't even know how to begin valuing it! If you want an honest honest honest opinion of value, you need to have Safeguard value it. However, it sounds like you're not over the moon with the ring and in all honesty I wouldn't pay £1k for a ring that I wasn't bowled over by.
If you want to compare the prices of Alex look here:
http://www.multicolour.com/gallery/index.html?/gallery/single/alexandrite/&1308455747
I've sorted this so the most expensive show first. As you'll see, the colour change is critical to value. When you look at your stone, be honest with yourself and judge the colour change by what your eyes are telling you and then look at similar stones in the link. Look at stones that are a similar carat weight and colour change to yours. If your stone is, for example, 1.30ct DON'T look at stones over 2ct to compare. Also don't look under 1.00ct. With good Alex's the price goes considerably higher when you get into the next carat bracket.
An orangey colour change is less sought after (and less in value) than the purple/pink. Alex's that change to red are VERY VERY VERY rare and if anybody tells you have one, they're telling porkies! There's only one in the world that's been photographed in an almost red state! You might see red flashes but definitely not a ruby red gem.
I hope that helps.
Edit: Sorry - I meant to say - value is also in the % of colour change. The whole gem must change and hold it's colour (you'll see that when you look at the link). If only part of the gem changes or it all changes but only some of the gem is purple while other bits just look dark, it's less valuable. The one in my avatar is an almost 100% changer. The colour when it changes should also be stable i.e. you shouldn't have to move it around to see the colour change it should just look like a completely different gemstone from the daylight version.