Question: Can it identify lab created gemstones?
Answer:Yes, it can. You must know the refractory indexes for each gemstone and for the equivalent lab created gem as well. There is a slight difference. The index for glass is unique-(5+). The refractory index information can be found on the Gem Society s website. It is a great tool that I have used with light an see more

Question:Can stones which are in a setting be tested?
Answer:As long as you can get a flat surface to make contact with the liquid. If you can not, there are tutorials on what a reading should look like.

Features:
1. Specially designed for measuring the refractive index of gemstones and solid materials.
2. Lightweight and compact, easy to carry.
3. This refractometer features high accuracy and easy operation.
4. Identify single and double gems quickly and precisely.
5. Low battery consumption for long service time.
6. Approved by strict quality and safety standards for a long and trouble-free using.

Specification:
Condition: 100% Brand New
Item Type: Refractometer
Material: ABS
Refractive Index Range: 1.30-1.81 RI
Color: As Pictures Shown
Size: Approx. 13 * 6 * 3.5cm/5.1 * 2.4 * 1.4inch
Weight: Approx. 721g

Package List:
1 * Refractometer
1 * Electric Torch (Powered by 1 * AA battery which is NOT included))
1 * English Manual
1 * 3 ML Reflective Index Fluid