The Presidium Diamond Mate A works best as a repeatable screening step. Set up the sample, make controlled contact and record the displayed result before deciding whether further identification is needed.
Prepare the tester and sample
Use the power arrangement specified for the A model. Remove the probe cap, switch on and wait until the blinking green readiness light becomes steady.
The stone should be clean, dry and at the recommended room temperature. Follow the handbook’s preparation instructions, and do not test with a low-battery warning.
Before beginning, identify the result indicators and the separate metal-contact signal. Keeping the handbook beside you during the first session is more useful than relying on a remembered beep.
Make the documented contact
Keep your thumb and index finger on the tester’s serrated metal contact areas. For mounted jewelry, hold the piece securely; for a loose stone, use the specified metal rest and hold that rest.
Place the probe perpendicular to a suitable facet, applying the light pressure needed to depress the retractable tip. Avoid the setting.
Work over a suitable surface and stop if the stone or jewelry is unstable. Do not force access to a tiny stone by levering against a prong.
Read the indication correctly
The handbook assigns red to a simulant indication and green with a continuous tone to its diamond indication. An intermittent metal alert means you need to correct contact.
The diamond indication does not distinguish moissanite or establish natural origin. Record the indication as a screening observation.
If an important result is unexpected, repeat the documented procedure under suitable conditions and arrange supporting identification. Do not keep testing until a preferred answer appears.
Keep a simple record
Note the item, stone location, device model and result. On a multi-stone piece, identify exactly which stone was checked rather than labeling the entire item from one reading.
For repeat work, a small worksheet makes it easier to notice changes in technique or unexplained results.
Our recommendation
The Diamond Mate A is worth considering when a thermal screening stage fits your process and you understand its limits. Keep the current matching handbook with the instrument, protect the probe between uses and use manufacturer support if its behavior becomes uncertain.
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