Loose natural diamonds
An ever-changing parcel of certified and non-certified stones, from melee to statement sizes — rounds, fancies, and calibrated goods.
- Round & fancy shapes
- Single stones & parcels
- Lab reports matched
- Melee to 5 ct+
Wholesale diamond house
Natural diamonds, at wholesale value.
C.M. Diamond supplies loose natural diamonds and finished diamond jewelry to the trade. Natural stones and ready-to-sell pieces — graded honestly, priced for your margin.
100% naturalnever lab-grown stock
Independently gradedlab reports where available
Trade onlywholesale pricing, no retail markup
What we carry
Two sides of one house
Whether you buy single stones for custom work or showcase-ready jewelry, everything we sell is natural diamond only — no lab-grown, no simulants, no confusion. Browse either side of the house in the live stock list.
Diamond jewelry
Finished pieces set exclusively with natural diamonds — engagement rings, studs, tennis classics, and everyday diamonds for the case.
- Rings & engagement
- Earrings & necklaces
- Bracelets & pendants
- Gold & platinum
Live stock list
The stock list
Our loose diamonds and finished jewelry, searchable and sortable the way the trade buys — by shape, carat, color, clarity, and price. Filter the parcels below.
This inventory is locked
Our loose diamond and jewelry stock list is reserved for registered trade members. Sign up with your name and business details — it takes under a minute — and the full inventory unlocks instantly.
Demo These are sample rows showing how the stock list works. They are not real inventory.
| Stock # | Shape | Carat | Color | Clarity | Cut | Fluor. | Lab | Price | $/ct | Status |
|---|
No diamonds listed yet
Add your first stone, import a stock file, or load demo rows to see the stock list in action.
No jewelry listed yet
Add your first piece, import a stock file, or load demo rows to see the stock list in action.
Entries you add or import stay in this tab only and are never sent anywhere — export to CSV or JSON to keep a copy of your list.
Loose natural diamonds
Grading you can verify, stone by stone
Every loose diamond we sell is a natural, earth-mined stone — graded under standard conditions. Certified stones are matched to their grading report by certificate number. No treatments you don't know about, no surprises at the bench.
- 01Natural, every stoneWe buy and sell natural diamonds only. Each parcel is screened so lab-grown and treated stones never enter the mix.
- 02Major-lab reportsCertified stones ship with reports from GIA, IGI, HRD, or EGL, matched by cert number and double-checked on arrival.
- 03Parcels matched to orderNeed a layout? Ask for a parcel matched by carat, color, and clarity for your design, and we'll pull it for approval.
- 04Priced per carat, clearlyEvery listing shows total price and price per carat, so your resale math is instant.
Shapes we stock
Round
Oval
Cushion
Princess
Emerald
Asscher
Radiant
Pear
Marquise
Heart
Diamond jewelry
Finished pieces, ready for the case
Set only with natural diamonds, our jewelry is bench-checked piece by piece — prongs, melee, finish — before it earns a stock number. Buy it ready to show, with margin built in.
- Engagement ringsSolitaire and accent settings for center stones from melee to multi-carat.
- EarringsMatched studs, hoops, and drops in calibrated natural melee.
- Necklaces & pendantsSolitaire pendants and graduated layouts in 14k and 18k gold.
- BraceletsTennis bracelets and bangles with matched natural diamonds.
Diamond knowledge
Learn the 4Cs
One short course in diamond quality — the same language every listing in our stock list is written in.
Carat — the weight of the stone
One carat equals 0.20 grams, and is divided into 100 points. A 1.00 ct stone weighs as much as twenty 5-point melee stones — but because large rough is rare, price per carat climbs steeply at each whole-carat mark.
0.10–0.30 ct · Melee0.50 ct · ~5.1 mm1.00 ct · ~6.5 mm2.00 ct · ~8.1 mm3.00 ct · ~9.4 mm
Round-brilliant diameters are approximate and vary with proportions; always confirm with the listed measurements.
Color — graded D to Z
The GIA color scale runs D (colorless) through Z (light yellow or brown). Grades are assessed face-down under controlled lighting, comparing the stone against master stones. Most buyers find the D–J range offers the best balance of beauty and value.
DEFGHIJKLMN–RS–Z
D–F are considered colorless, G–J near-colorless, and K–M faintly tinted. Beyond Z, stones become fancy colors — a separate market with its own grading.
Clarity — the fingerprint of nature
Clarity measures internal inclusions and external blemishes, viewed at 10× magnification. Inclusions are nature's signature — proof the stone formed in the earth, not in a lab. Many remain invisible to the unaided eye.
FLIFVVS1VVS2VS1VS2SI1SI2I1I2I3
FL (flawless) to I3 (included). For value, VS1–VS2 and eye-clean SI1 stones are the trade's sweet spot: clean to the eye at a fraction of the top grades' price.
Cut — the one C decided by hand
Cut is the only C shaped entirely by the cutter: proportions, symmetry, and polish that determine how a diamond handles light. A well-cut stone returns light to the eye as brilliance; a poor cut leaks it out the back, whatever its color and clarity.
ExcellentIdealVery GoodGoodFairPoor
Cut grades apply to standard round brilliants; fancy shapes are evaluated mainly on polish, symmetry, and overall make. Two stones of identical weight can look very different in size depending on cut.
How trade works
From request to shipment
A straightforward trade workflow — built around how jewelers, manufacturers, and designers actually buy diamonds.
Request access
Tell us about your business below. Trade pricing is reserved for verified industry accounts.
Browse & reserve
Search the stock list by shape, carat, color, and clarity, then request stones to hold for review.
Confirm & memo
Approve stones by cert number and seal the deal — memos available to established accounts.
Insured delivery
Every shipment is fully insured and tracked, packed for the trade from our vault to your bench.
Trade inquiries
Request trade access
Wholesale pricing is extended to verified trade buyers only. Send us your business details and we'll take it from there.
- Who qualifies: retail jewelers, manufacturers, designers, and diamond dealers with an active trade business.
- What to prepare: your business name, a business email or phone number, and what you buy — loose stones, finished jewelry, or both.
- What happens next: a trade specialist reviews your request and reaches out to set up your account.