Gem Refractometer Refractive Index Fluid Liquid Oil RI 1.8

I've been collecting gemstones for nearly twenty years and periodically verify stones from auctions, estate sales, and private collections. Reliable refractive index measurements are one of the most important tests available, so I never compromise on RI fluid quality. This product exceeded my expectations. The fluid creates excellent optical contact and produces distinct readings across a wide range of materials. During recent testing sessions I examined garnets, tourmalines, spinels, quartz, beryl, and corundum specimens. The readings matched expected values and helped confirm several questionable stones. Another benefit is the bottle design, which allows precise dispensing without wasting material. The fluid remains clear and usable even after repeated openings. Based on my experience, this is a dependable product suitable for hobbyists, students, jewelry professionals, and serious collectors alike.

The fluid itself worked fine and provided accurate readings on my refractometer. However, my bottle had a small amount of leakage inside the package when it arrived. Fortunately, very little product was lost and customer service responded promptly. Since the fluid performs well, I'm still giving it three stars, but I hope packaging can be improved in the future.

I've purchased several bottles of refractive index fluid over the years and this one compares favorably with products costing significantly more. The bottle seals tightly and doesn't appear to evaporate as quickly as some competing brands. I use it mainly for examining colored stones acquired from gem shows and estate sales. The measurements obtained are consistent and repeatable. The clarity of the fluid makes observation easier and helps reduce uncertainty during testing. Shipping was fast, packaging was secure, and the product arrived exactly as described. Overall, an excellent value for anyone maintaining a gemological workstation.

As someone relatively new to gemology, I wasn't sure whether all RI fluids were basically the same. After using this product in my home lab, I can say it definitely gets the job done. The fluid spreads nicely on the refractometer and creates excellent optical contact. I was able to successfully distinguish several gemstones that had previously confused me when relying only on visual inspection. The shadow edge was crisp and easy to interpret. What impressed me most was how little fluid was required for each test. One small drop is usually enough, making the bottle last much longer than I originally expected. Very satisfied with the purchase.

Needed RI fluid quickly for a gemology course and this worked perfectly. The bottle size was larger than expected and should last me a long time. Readings were clear and easy to obtain.

I operate a small jewelry appraisal business and accurate refractive index readings are essential to my work. This fluid has become my go-to choice because it consistently provides clean contact between the stone and refractometer surface. I've tested diamonds, sapphires, spinels, garnets, quartz varieties, and numerous synthetic materials using this fluid. The readings have been repeatable and reliable. The viscosity is appropriate and easy to control, preventing excessive waste. After several months of use, the fluid remains stable and clear. I store it properly and have experienced no degradation. I would confidently recommend this product to students, hobbyists, and professionals alike.

The bottle arrived well packaged with no leaks. I purchased it as a replacement for an older bottle that had expired. The fluid produced sharp shadow edges on my refractometer and helped me quickly identify several stones from an estate collection. For the price, I have no complaints. Will buy again when needed.

I've been using this RI fluid for several months with my refractometer and it performs exactly as expected. The readings are consistent and the liquid remains clear with no noticeable contamination. A little goes a long way. Highly recommended for anyone doing regular gemstone identification.

I like this one. Better than my old one. Works well.

What I liked about this product is that it feels very high quality it came from the United States. Oregon. It also came with an insightful Direction pamphlet and a refractive index chart thanks you guys

Works great and is easy to read.

After getting some duds in this price range, I was pleased to get this refractometer. It gives a good clear reading and feels like a quality instrument. This style is easier for me to use on faceted gems than the more $ GIA model. You need to order the RI fluid separately (expect to spend around $80 for the good stuff). My only complaint is that you better have extra batteries on hand in case you accidently leave the internal light on (there is a side push button), as there is no way to use an external light source. And the directions for the batteries and battery compartment don't match this instrument, but you can easily figure it out. Other than that, this is great quality and value.

Read update and progress - essential tool for refraction !!!

This is essential for gemologist and the best quantity for the money.

Got here really fast, like next day fast. Works fine for me as an amateur gemologist

I am grateful to know there is a place I can get RI fluid without having to spend a fortune. I look forward to using it.

Is what it is.. works well and stinks like it's supposed to.

Appears to be 1.80 r.i. My bottle arrived 1/2 full. This is not 10 GM of fluid. The shipping waa quick. I am very disappointed on the quantity.

The bottle was received and had leaked. It has a very bad smell that is difficult to remove. I asked for a refund yesterday, and have not heard back.

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