Long-held houses, long-held jewelry boxes
Mountainside broke away from Westfield Township and became its own borough in 1895, and it has stayed small and residential, about 7,000 people in Union County. Much of its land is the Watchung Reservation, the county's largest park, home to Surprise Lake and the Trailside Nature and Science Center. Children's Specialized Hospital has its main campus here, and Echo Lake Park runs along the border with Westfield.
Families tend to buy a house here and stay for decades, so the jewelry that reaches our counter has usually been collected over a lifetime rather than bought to resell. A typical Mountainside box holds a mix of everything: a 10K class ring, 14K chains from the 1980s, an 18K bracelet brought back from a trip to Italy, a charm bracelet built one charm at a time, and a few pieces that look like gold but may not be.
Why a mixed jewelry box is sorted before anything is weighed
Karat is the share of pure gold in the metal, and it changes the value of every gram. 10K is 41.7 percent gold, 14K is 58.5 percent, 18K is 75 percent and 22K is 91.7 percent. Pile a whole box on one scale and price it at the lowest karat, and the 18K bracelet is paid as if it were 10K. We separate every piece by karat first and weigh each group on its own.
Stamps help but do not settle it. GF means gold filled, GP or GEP means gold plated, and HGE means heavy gold electroplate: a thin layer of gold over base metal, worth very little as metal. Old European pieces are often marked 750 for 18K or 585 for 14K. The XRF analyzer reads the real alloy through the surface, backed by an acid test, so a worn stamp or a missing one is not a problem. More on each karat is on the gold jewelry page.
What sellers say about the Middlesex counter
“Cash for Gold in Middlesex was extremely helpful & very fair. Make sure you ask for Chris he is wonderful!!!!!”
Theresa Bjornsen, five-star Google review of Cash 4 Gold Trading Post in Middlesex
A Saturday errand from the Watchung ridge
Middlesex is open Monday through Friday from 10 to 6 and Saturday from 10 to 4, and it is closed Sunday. For Mountainside households where everyone works during the week, Saturday morning is the usual time to come. No appointment is needed, and a typical visit takes about 15 minutes.
Clearing out a parent's house instead of one jewelry box? The estate buyers service can look at a full household, and the silver buying page covers flatware, tea sets and trays.
Route 22 west, then south through Dunellen
From Mountainside, take Route 22 west past Scotch Plains and Watchung into Green Brook, then head south through Dunellen into Middlesex, where the store is at 748 Bound Brook Road. Allow about 25 minutes, a little more in Route 22 rush hour.
Which parts of Mountainside and its neighbours do we hear from?
Homes along Mountain Avenue and New Providence Road, the streets that back onto the Watchung Reservation, the Route 22 business strip, and the blocks near Echo Lake Park. Neighbours in Westfield, Springfield, Summit, Berkeley Heights and Scotch Plains take the same drive west.
What do Mountainside sellers bring down Route 22?
Mostly mixed gold jewelry, often sterling, and now and then a diamond or a watch. Open a category to see how each is judged.
How a Mountainside sale goes at the counter
Set everything down and show your ID. The gold is split into 10K, 14K, 18K and higher, plated and filled pieces are set aside, and sterling is separated from plate. Each group is tested and weighed in view and priced at the live market that day, with diamonds, watches and collector coins quoted on their own. Accept and you are paid before you go. Decline and it all goes back in your bag, free.
A jewelry box of mixed karats, a charm bracelet, a watch from a drawer? Bring it down Route 22 on a weekday or Saturday and watch every piece tested, free.
📞 Get a Free Appraisal: (732) 629-7600Mountainside cash for gold: frequently asked questions
How long is the drive from Mountainside to the Middlesex gold buyer?
About 25 minutes. Take Route 22 west through Scotch Plains and Watchung to Green Brook, then south through Dunellen into Middlesex. The store is at 748 Bound Brook Rd, phone (732) 629-7600.
Can Mountainside sellers come in on a Saturday?
Yes. Middlesex is open Saturday from 10 to 4, as well as Monday through Friday from 10 to 6, and closed Sunday. No appointment is needed; bring a government photo ID.
How is a Mountainside jewelry box with 10K, 14K and 18K pieces priced?
Each karat is weighed and priced as its own group. 10K is 41.7 percent gold, 14K is 58.5 percent and 18K is 75 percent, so mixing them on one scale would underpay the higher karats. Diamonds and branded pieces are judged separately.
Is jewelry stamped GF, GP or HGE worth bringing from Mountainside?
Bring it, but expect little. Those stamps mean gold filled or gold plated, a thin gold layer over base metal. The XRF analyzer confirms what each piece really is at no charge, and occasionally an unmarked piece turns out to be solid gold.
Do you buy from Mountainside homes near the Watchung Reservation and Echo Lake Park?
Yes. Sellers come from every part of Mountainside, including the streets along the reservation, Mountain Avenue and New Providence Road, and from Westfield, Springfield, Summit, Berkeley Heights and Scotch Plains nearby.
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