Carat Hunter · Diamond retailer comparisons

Blue Nile vs Moon Ocean

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

Data current as of September 14, 2026 · Updated daily. Zero affiliate revenue.

At a glance

	Blue Nile	Moon Ocean
Founded	1999	2022
Headquarters	Seattle, WA	London, United Kingdom
Live listings	105,467	647,192
Origin mix	Lab + Natural	Lab + Natural
Cert labs accepted	DF · EGL · EGL USA · GCAL · GIA · HRD · IGI · NULL · R&F · UNKNOWN	AGS · DF · EGL · GCAL · GIA · GIAL · HRD · IGI · NON · NONE · NULL · OTHER · R&F · UNKNOWN · WISE
Ships to	US · CA · UK · AU	UK · International
Return window	30 days	30 days

Live listings, origin mix and accepted labs are updated daily. Founded, headquarters, shipping and return details are retailer-provided and were last verified September 2, 2026.

What each store stocks

Inventory composition observed live across each store's listings.

Blue Nile

Origin mix

Lab-grown 30%Natural 70%

Most common shapes

Round 39%·Oval 14%·Cushion 12%·Princess 9%

Moon Ocean

Origin mix

Lab-grown 62%Natural 38%

Most common shapes

Round 47%·Oval 16%·Pear 10%·Cushion 7%

Stones stocked by both

We track 15,147 diamonds currently listed at both stores.

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 Hong Kong? Neither store ships there.
Need GIA grading? Both stores carry it.
Need IGI grading? Both stores carry it.
Need HRD grading? Both stores carry it.
Moon Ocean stocks more lab-grown. Blue Nile stocks more lab-grown.

Looking for a specific spec?

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

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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?

Live listings refresh daily. Static facts refresh monthly.

How do I find a specific stone at both stores?

Use the GIA or IGI certificate number in our search.