Overall it looks good. Things you can improve.
Resize the images in the slide show to the same size so the slides dont bounce.
Your logo is really small, make larger and possibly move it to the left or right above the menu. avoid having everything centred
The about us desription on the home page is fine, but remove the about us heading or change the heading to something my appealing.
remove my diamond until you have something to put in there. Alternatively it could used by customers who have bought and want to show off what have.
contact us just one email, it is easier for you to manage in any case.
connect for wholesale, move infomation or add an email for wholesale enquiries
change jewellery education to jewellery care
remove newsletter link until setup correctly
no mention about delivery or shipping
under Why Bijou Diamonds remove 'Bijou Diamond Ensures' you need it
the footer neeeds to space more across the bottom of the page
You must proof read everything. You have spelling errors, spaces between words and paragraphs are incosistent, pronunciation, and so on.
I do like your facebook and google + pages, spot on
Hope this is helpful to you
You will have to focus on following things :
Please avoid following common mistakes :
To increase ranking of e-commerce website use social media including social networks,blogs,guest posting and problem solving articles.
Rest you can find on google.I can't write lengthy replies :-)
Others here mentioned some good points. I'd like to add: