No doubt, the two largest and recognized sellers of diamonds online are www.Abazias.com and www.BlueNile.com. Both have thousands of diamonds in stock and both offer a unique search feature in paring down the diamond of your choice.

Upon landing on the Abazias homepage, you are welcomed with a plethora of information on diamonds. In addition, they have over 130,000 diamonds in inventory. The search for a diamond is user friendly. One can select diamond shape, price, weight and color by simply ticking off the diamond shape (cut) and then toggling a diamond on a graph bar to select price, weight and color. Once the parameters of the search are selected, the user clicks the "View Results" button and the information is presented for review.

Need a setting? Select your diamond and then click on the "Search for a Setting" button located above your loose diamond result.

The price of a one carat a premium cut, GIA Certified, VVS1, D- Color (Abazias) diamond (this morning) was $10,436.20.. 

Blue Nile offers a similar search function however, it's a bit cumbersome. The user has to narrow their search using an up and down toggle search feature. The results appear through a refined search. A search for a one carat Very Good cut, GIA Certified, VVS1, D-Color diamond yielded just a few diamonds. The search function could be improved, as if the end user toggles the search function without knowledge as to how the search feature operates, the end search could yield very few results.

The cost of a comparable diamond (as offered by Blue Nile) was $12,251.00...

Using Blue Nile's broaden search feature yielded only two diamonds (round) which were VVS1 diamonds, D Color. One would have to broaden their search (fully expand the search bar and criteria) to yield results, which do offer various cuts, colors and carat weights. Once expanding the search, we yielded 18,000 diamonds for preview.

The total Blue Nile inventory of diamonds yielded 65,000 diamonds for preview...

Abazias.com offers an extensive inventory of loose diamonds plus, a user friendly search feature, the comparison in price is of paramount importance to the end user. Searching for a 1 Carat Diamond, SI2, F Color, Excellent Cut with EGL certificate, we yielded one diamond at a cost of $3,005.10.

The cost of a similar on diamond on Blue Nile was $4,112.00..

The depth of the Blue Nile diamond was 60.02%, table 59%, Girdle - medium to thick. The diamond offered by Abazias.com has a depth of 66.9%, table 58%, Girdle - F (Abazias rating).

The only discernible difference between the diamonds was fluorescence. The Abazias diamond offers a faint fluorescence while the Blue Nile diamond offers a strong fluorescence.

Summary: Blue Nile:

Search Function: Good
Consumer Education: Excellent
Diamond Price: Fair
Inventory Offering: Good
Overall Rating: Good

Summary: Abazias:

Search Function: Excellent
Consumer Education: Excellent
Diamond Price: Excellent
Inventory Offering: Excellent
Overall Rating: Excellent

Customer service was not rated nor delivery turn around time. The above rating was obtained by conducting random searches on both sites. Price difference may attributable to various factors such as; grading opinions by gemological laboratories.