

💎 Test Like a Pro, Shine Like a Boss
The GAIN EXPRESS Diamond Tester Pen is a professional-grade gemstone tester combining thermal sensors and UV light technology to accurately distinguish natural diamonds from simulants like moissanite and cubic zirconia. Designed for both novices and experts, it features a compact, battery-efficient design with audible metal contact alerts and comes complete with a testing platform and carrying pouch.









| ASIN | B00MNEB0U0 |
| Batteries Required? | No |
| Batteries included? | No |
| Battery Cell Type | Alkaline |
| Battery description | Batería 9v |
| Best Sellers Rank | 233,322 in DIY & Tools ( See Top 100 in DIY & Tools ) 667 in Multi Testers |
| Customer Reviews | 3.8 3.8 out of 5 stars (150) |
| Date First Available | 5 Sept. 2014 |
| Item Package Quantity | 1 |
| Item Weight | 150 g |
| Item model number | JEM-II |
| Manufacturer | Gain Express Holdings Ltd. |
| Part Number | JEM-II |
| Power Source | Battery Powered |
| Product Dimensions | 17.78 x 7.62 x 5.08 cm; 149.69 g |
| Style | Compact |
W**M
Good product for the price.
Very easy to use. Good price.
H**Y
Good product
Worked better than I thought
W**M
Easy to use
Good materials, look good, easy to use. Just tested on my wife diamond ring, the result is quite good.
M**S
Fast and liable
Ir is a fine item
W**!
Real Diamond Tester 💎
I rarely ever leave a review but for this I had to! It tests actual diamonds accurately! It also when tested on other minerals doesn’t tick off as if it’s the real thing unlike many of the cheap ones out there. This is the real deal.
P**A
Discreto qualità prezzo
G**R
Schnell seriös und zuverlässig
A**A
Hay que insistir. El aparato funciona porque lo hemos probado con joyas que sabíamos que eran buenas y otras que sabíamos que no. Pero y tengo que decir que hay veces que pita y otras que no en la misma piedra o sea que cuidado con dar por malo algo que puede ser un brillante, mejor repetir la operación unas cuantas veces porque le cuesta. Eso sí, si la piedra es mala no va a pitar lo pongas como lo pongas.
A**O
This tester can’t tell the difference between diamonds and moissanite.
Y**E
Magnifique, svp très fort.
Trustpilot
1 week ago
1 month ago