Question 1

What does calibrated mean for gemstones?

Accepted Answer

A calibrated gemstone is cut to a standard millimetre size, such as a 3 mm round or a 6 x 4 mm oval, so it fits a pre-made setting. Calibration allows manufacturers to produce jewellery in repeatable designs without having each mounting made to suit a single stone. Tolerances vary between suppliers, so specify the accuracy you need when ordering.

Question 2

How closely can matched pairs be matched?

Accepted Answer

Well-matched pairs are alike in size, shape, colour, tone and brightness when viewed side by side. Because every natural stone is different, a perfect match is rare, and the closeness achievable depends on the gem, the size and the colour. Common colours in small sizes can be matched closely, while fine, larger stones take longer to pair.

Question 3

Can calibrated stones come with lab reports?

Accepted Answer

Laboratory reports are normally issued for individual stones, and for small calibrated sizes the cost of a report is often high relative to the value of the stone. For important centre stones, larger pairs or significant layouts, reports are more common. If your project requires reports, tell us at the start, since it affects which stones we can offer and how long it takes.

Question 4

What information do you need to find calibrated stones for me?

Accepted Answer

Please tell us the gemstone, shape, exact millimetre size and tolerance, quantity, colour range and any treatment requirements, such as unheated sapphire or minor oil only for emerald. A reference photo or sample stone is very helpful. Also mention the deadline for your production, so we can advise on what is realistic for the quantity and quality you need.

Calibrated Gemstones