Looks really nice Jon..
I like the background colors a lot..
The thumbnail images load just a bit slow.. I can't recall what had to do for my Zencart to remedy that. There might be something during the process of adding your products and images that might help that. Wish I could recall what it was on mine...
Although it is only noticable when first opening the site up.. Once opened and I start navigating through the site, everything opens up lightening fast.. !
Maybe because OS is not set up the same, but with my cart I have a lot of additional info within the <Head> Header.
When I view your page source I only see this...
<meta http-equiv="Content-Type" content="text/html; charset=iso-8859-1">
<title>Night Stone Jewelry</title>
<link rel="stylesheet" type="text/css" href="stylesheet.css">
As compared to what mine looks like.. These additional meta codes contribute greatly to how your site gets indexed via the various search engines.
<title>TaoGem, Gemstone cabochons</title>
<meta http-equiv="Content-Type" content="text/html; charset=iso-8859-1" />
<meta name="keywords" content="wholesale, gemstone, cabochon, cabochons, design, supplies, bezel, silver, solder, settings, morrisonite, carrasite, fossil, agate, malachite, chrysocolla, chrysophase, jasper, lapidary, dendritic" />
<meta name="description" content="wholesale gemstone cabochon bezel type setting supplies for silver solder jewelry design" />
Price wise.... From the few items you have listed they seem ok with the exception of the intarsia.. Pretty high
I don't have the expertise with Opal so can't really judge.
Just my two cents !