Carat Hunter · Diamond retailer comparisons
Diamond Quarter vs Moon Ocean
Side-by-side store comparison. Independent and non-promotional.
Data current as of November 7, 2026 · Based on current listings. Zero affiliate revenue.
At a glance
| Diamond Quarter | Moon Ocean | |
|---|---|---|
| Founded | Not provided | 2022 |
| Headquarters | Birmingham, United Kingdom | London, United Kingdom |
| Current listings | 1,118,933 | 1,006,355 |
| Origin mix | Lab + Natural | Lab + Natural |
| Cert labs accepted | AGS · EGL · GCAL · GIA · GSI · HRD · IGI | EGL · GCAL · GIA · HRD · IGI |
| Ships to | UK | UK · International |
| Return window | 30 days | 30 days |
| Terms checked | Not yet verified | Not yet verified |
Listing counts, origin mix and accepted labs reflect current listings. 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.
Diamond Quarter
Origin mix
Most common shapes
Moon Ocean
Origin mix
Most common shapes
Stones stocked by both
No overlap right now
These stores do not currently share any of the same physical diamonds. Their inventories are mostly distinct.
Pick by what you are looking for
- Need shipping to Ireland? Only Moon Ocean ships there.
- Need GIA grading? Both stores carry it.
- Need IGI grading? Both stores carry it.
- Need HRD grading? Both stores carry it.
- Diamond Quarter stocks more lab-grown. Moon Ocean stocks more lab-grown.
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 specQuestions 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.