มีบัญชีผู้ใช้อยู่แล้วใช่หรือไม่
เข้าสู่ระบบเพื่อชำระเงินให้รวดเร็วยิ่งขึ้น

It measures a gemstone's refractive index, one of the most diagnostic properties in gem identification. Comparing the RI reading against reference tables separates many similar-looking stones in seconds.
Yes, standard refractometer contact fluid is required between the stone and the hemicylinder for accurate readings, as with all critical-angle refractometers.
Yes, with a little practice. Reading the shadow edge takes a session or two to learn; our step-by-step refractometer guide on the blog walks through the technique.
Yes. We ship worldwide from Bangkok, Thailand, and our gemologists can help you get started after delivery.