Carat Hunter · Diamond retailer comparisons

Adiamor vs Blue Nile

Side-by-side store comparison. Independent and non-promotional.

Data current as of October 29, 2026 · Updated daily. Zero affiliate revenue.

At a glance

	Adiamor	Blue Nile
Founded	1999	1999
Headquarters	Los Angeles, CA	Seattle, WA
Current listings	1,044,623	376,585
Origin mix	Lab + Natural	Lab + Natural
Cert labs accepted	AGS · EGL · GCAL · GIA · HRD · IGI · R&F · STULLER	AGS · DF · EGL · EGL USA · EGLUSA · GCAL · GIA · GSI · HRD · IGI · R&F · SGS · STULLER · UNKNOWN
Ships to	US · CA	US · CA · UK · AU
Return window	30 days	30 days
Terms checked	Not yet verified	Not yet verified

Current listings, origin mix and accepted labs are updated daily. Founded, headquarters and shipping come from public sources. Return terms are our summary of each retailer's own policy page, dated per retailer in the table. Retailers change their terms, so check the retailer's own returns and shipping pages before you buy.

What each store stocks

Inventory composition observed across each store's current listings.

Adiamor

Origin mix

Lab-grown 83%Natural 17%

Most common shapes

Round 35%·Oval 15%·Emerald 9%·Pear 9%

Blue Nile

Origin mix

Lab-grown 34%Natural 66%

Most common shapes

Round 32%·Oval 13%·Emerald 11%·Cushion 10%

Stones stocked by both

We track 43,094 diamonds currently listed at both stores.

Most common overlap: Oval, 3ct, lab-grown, D FL

Explore Oval 3ct D FL cohort

Each matched stone has its own page where both retailers' prices appear next to the same physical diamond. That is where price comparison happens, on the stone, not on this page.

Pick by what you are looking for

Need shipping to Australia? Only Blue Nile ships there.
Need GIA grading? Both stores carry it.
Need IGI grading? Both stores carry it.
Need HRD grading? Both stores carry it.
Adiamor stocks more lab-grown. Blue Nile stocks more natural.

Looking for a specific spec?

Browse every retailer in our index, grouped by shape, carat, colour, and clarity. Thousands of spec pages.

Browse where-to-buy by spec

Questions we get

Does Carat Hunter earn commission from either store?

No. We earn zero affiliate revenue from any retailer in our index.

Why do you not show price comparisons on this page?

Pricing varies per stone, not per store. Click through to any matched diamond above and you'll see both retailers' prices on the exact same physical stone, which is the real comparison.

How fresh is this data?

Listings refresh as we re-read each retailer, most of them every day. Static facts refresh monthly.

How do I find a specific stone at both stores?

Use the GIA or IGI certificate number in our search.