How selling diamonds works in Middlesex
Too often a seller hands over a ring, someone glances at it, and a number comes back with no explanation. That is not how we work. At our Middlesex location on Bound Brook Road, we show you exactly what we are doing and why.
Every diamond gets tested with a diamond tester to confirm it is real. Then we examine it under a 10x loupe and assess the four factors that determine value: cut, clarity, color, and carat weight. We tell you what we see, then we give you a price based on current wholesale market rates.
You can say yes and walk out with cash. You can say no and walk out with your diamond. Zero pressure either way.
First time selling gold? See sell gold in Middlesex, NJ and estate jewelry buyers serving Middlesex, NJ.
What we buy at this location
Engagement rings are the most common item people bring in: solitaires, three-stone rings and halo designs. We buy them all regardless of setting style. Diamonds show up in a lot of other jewelry too, and if it has a diamond in it, we want to see it.
| What you bring | How we value it |
|---|---|
| Engagement rings and anniversary bands | The diamond is graded on the 4Cs and the gold or platinum setting is paid separately against the live spot price |
| Tennis bracelets, cocktail rings, studs, pendants | Each stone is checked and the metal is weighed, so the offer covers both |
| Loose diamonds | Evaluated directly; GIA and AGS certificates help us confirm the grading faster |
| Lab-grown diamonds | Bought too. Lab diamonds are real diamonds, but their resale market is different, and we will be upfront about what yours is worth |
| Estate and inherited diamond jewelry | Free appraisal with no obligation, just honest information about what the pieces are worth on the open market |
If you have inherited diamond jewelry and are not sure of its value, we can help. There is no cost for the appraisal and no obligation to sell.
Bring it in and watch it valued at the counter. Free, no obligation, same-day cash.
Call the Middlesex store on (732) 629-7600Our diamond testing and evaluation process
At the Bound Brook Road counter, your diamond is graded the same way for a Somerset seller as for a Middlesex one, using the four Cs that set a stone's value. The whole process takes about 15 minutes.
| Step | What happens |
|---|---|
| 1. Verification | A thermal conductivity diamond tester confirms the stone is a genuine diamond in about 30 seconds, separating diamonds from simulants like cubic zirconia or moissanite |
| 2. Loupe inspection | Under 10x magnification we read clarity: internal inclusions, surface blemishes and overall transparency, plus cut quality and symmetry |
| 3. Color grading | We compare the stone against master stones on the D-to-Z scale. Colorless stones (D, E, F) bring the highest premiums |
| 4. Weighing | A precision scale gives the carat weight, measured to the hundredth of a carat |
| 5. Your offer | Based on the 4C assessment and current market prices, you get a cash offer on the spot |
Cut, color, clarity and carat
We begin with cut, studying the proportions and symmetry that control how much light a diamond throws back, because cut quality lifts the offer relative to current market rates. We grade color by comparing the stone against references along the D-to-Z scale. We read clarity under a 10x loupe to map any inclusions. We confirm carat on a precision scale measured to the hundredth.
Loose or set, certified or not
Loose diamonds and set diamonds are both fine to bring in. When the diamond is mounted we appraise it on its own and pay separately for the setting metal, since the gold or platinum mount holds value at the live spot price apart from the stone. If your diamond carries a GIA or AGS certificate, bring it and we will confirm the grade faster, but we appraise uncertified stones routinely and no paperwork is required.
One store, two counties
The Bound Brook Road store sits in the northwest corner of Middlesex County along the Route 28 corridor, right on the Middlesex and Somerset county line, bordering Bound Brook, Bridgewater, and Green Brook on the Somerset side. A seller in either county can reach our diamond counter in minutes.
On the Middlesex side, we draw from Dunellen, Piscataway, and South Plainfield. On the Somerset side, the store is just as convenient for Bound Brook borough, Bridgewater, Green Brook, Watchung, North Plainfield, Raritan, Somerville, and Manville. Most of these towns are a straight shot down Route 28 or a quick exit off I-287, and there is free parking right outside the door.
Searches for diamond and gold buyers in Somerset County tend to point people toward Somerville, even though our Middlesex store physically sits on the Somerset border and serves those towns directly. One trip handles diamonds from either county, with the stone and any gold or platinum setting appraised together into a single offer.
Middlesex store details
The Middlesex store is a walk-in counter at 748 Bound Brook Rd, Middlesex, New Jersey 08846. Here is everything you need before you set off.
| Detail | Middlesex store |
|---|---|
| Address | 748 Bound Brook Rd, Middlesex, NJ 08846 |
| Phone | (732) 629-7600 |
| Hours, Mon-Fri | 10 AM to 6 PM |
| Hours, Sat | 10 AM to 4 PM |
| Hours, Sun | Closed |
| Appointment | Not needed. Walk in any time the doors are open |
| What to bring | A valid government-issued photo ID, required by New Jersey law, plus any GIA or AGS paperwork you have |
| Cost of an appraisal | Free, with no obligation to sell |
| How you are paid | Cash the same day, once you accept the offer |
Call (732) 629-7600, request an appraisal online, or visit our diamond selling page for more details. The Middlesex store page has directions and the map.
Free appraisal, no obligation, and you keep your diamond if you say no.
Call Middlesex on (732) 629-7600Common questions about selling diamonds in Middlesex
Where can I sell diamonds in Middlesex, NJ?
At the Cash 4 Gold Trading Post Middlesex store, 748 Bound Brook Rd, Middlesex, NJ 08846. Walk in during store hours or call (732) 629-7600 first.
Do I need a certificate to sell a diamond here?
No. A GIA or AGS certificate helps us confirm the grade faster, but we appraise uncertified stones routinely and no paperwork is required.
Do you buy lab-grown diamonds?
Yes. Lab diamonds are real diamonds with a different resale market, and we will tell you plainly what yours is worth.
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