Here we present the LPHT-20, our current standard furnace model, designed for LPHT treatment of diamonds in vacuum.

The LPHT-20 can be used for commercial purposes, for example the color treatment of diamonds. It is also a unique research instrument, used for the study of properties of diamond.

Image LPHT Furnance


Our standard furnace LPHT-20 is designed for LPHT treatment of diamonds in vacuum at temperatures from 600°C to 2100°C. The furnace can be used for annealing of individual samples (research) and for small scale commercial color treatment.

Contact us to find out more and discuss custom solutions tailored to your needs.

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Technical Specifications & Parameters


Width: 550 mm
Depth: 620 mm
Height: 1000 mm

Weight: 50 kg

Base vacuum: 5e10-6 mbar

Sample Container

Diameter: 20 mm
Height: 20 mm


One phase 208-240V, 30A

Three-phase variant available upon request


Water-based cooling system

Pressure: 2 atm at 4 litre/min


Range: 400°C - 2100°C

Temperature ramp up/down at high temperatures is a few minutes


Treatment time: 1 min to several days

Typical cycle time for processing of brown CVD diamonds: 15 minutes