Carat Hunter · Diamond retailer comparisons
Carbon Sparkle vs Diamond Quarter
Side-by-side store comparison. Independent and non-promotional.
Data current as of September 20, 2026 · Updated daily. Zero affiliate revenue.
At a glance
| Carbon Sparkle | Diamond Quarter | |
|---|---|---|
| Founded | Not provided | Not provided |
| Headquarters | Winter Haven, FL, US | Birmingham, United Kingdom |
| Live listings | 902,327 | 776,736 |
| Origin mix | Lab + Natural | Lab + Natural |
| Cert labs accepted | AGS · CGL · DF · EGL · EGL USA · EGLUSA · GCAL · GIA · GIAL · GSI · HRD · IGI · IGI be · NONE · NULL · None · OTHER · R&F · SGL · UNKNOWN · WISE · igi | AGS · DF · DFC · EGL · GCAL · GIA · GSI · HRD · IGI · SHANE |
| Ships to | US · CA · UK · EU | UK |
| Return window | 21 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.
Carbon Sparkle
Origin mix
Most common shapes
Diamond Quarter
Origin mix
Most common shapes
Stones stocked by both
No live 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 New Zealand? 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.
- Diamond Quarter stocks more natural. Carbon Sparkle stocks more lab-grown.
Looking for a specific spec?
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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?
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.