ARI™ by Presidium - Diamond, CVD/HPHT, Moissanite Tester

The Presidium ARI™ (Advanced Refractive Index) is a professional, handheld PRESIDIUM DIAMOND VERIFICATION INSTRUMENT™ designed to accurately distinguish colorless natural diamonds from CVD/HPHT lab-grown diamonds and all types of moissanite. Engineered for both loose stones and mounted jewelry, including closed-back settings, it delivers dependable identification in just 3 seconds.

Using advanced UV light absorbance technology, ARI analyzes the optical response of each gemstone to provide clear, instant results displayed on its intuitive touchscreen color LCD.
Test outcomes are shown as:
“Diamond”, “CVD/HPHT/Type IIa”, or “Moissanite.”

Lightweight, ergonomic, and fully portable, ARI is ideal for jewelers, gemologists, appraisers, buyers, and retailers who need fast, accurate verification on the go. Backed by a 1-year warranty, it operates on 3× AAA batteries (up to 4 hours) or the Presidium AC adaptor.

Key Features:

• User-safe UV Retractable Optical Probe activates only when in contact with the stone
• Alert buzzer warns of lost contact during testing
• Touchscreen GUI with 6 language options
• Portable, ergonomic design—perfect for mobile use
• Tests colorless diamonds and moissanites from D–J color
• Suitable for both left- and right-handed users

Benefits:

• Reliably distinguishes natural diamonds from CVD/HPHT lab-grown diamonds and all moissanites, including low-conductivity types
• Works with loose stones and mounted jewelry, even in closed-back settings
• Replaceable optical probe tip reduces downtime and extends product lifespan
• Ultra-fast 3-second consecutive testing
• Tests polished stones of all proportional cuts as small as 0.02 ct

Dimensions:
Length - 190 mm (7.5 in)
Width - 46 mm (1.8 in)
Height - 25 mm (0.9 in)
Weight (without batteries) - 60 g (0.13 lb)

Klick here for Ari user manual