Assessing Diamond Value: The Four C's

What is the standard weight of a carat in grams?

0.2 g

What is the equivalent weight of 100 points in carats?

1.00 ct

How are small diamonds under approximately 0.20ct often referred to?

'melee'

What does a diamond graded as 'D' signify in terms of color?

Colourless - Exceptional White Signup and view all the answers

What is the method used for grading fancy colors in diamonds?

Master stones and pre-graded color comparison diamonds Signup and view all the answers

What is the main factor considered for grading fancy colors in diamonds?

The depth of color and desirability of the hue Signup and view all the answers

Which factor may make the CZ master stones less accurate for estimating the colour-group grade?

All of the above Signup and view all the answers

Why is it NOT POSSIBLE to accurately colour grade a mounted diamond?

All of the above Signup and view all the answers

What are fancy coloured diamonds graded for?

Hue, saturation, and tone Signup and view all the answers

Which factor may influence the colour of a diamond seen in daylight if it is strongly fluorescent?

All of the above Signup and view all the answers

What do we primarily grade for when using dark-field illumination/edge of the light beam during clarity grading?

Internals Signup and view all the answers

What is the nature of a 'feather' in a diamond, and how does it affect the stone?

Actual break in the stone; affects brilliance and clarity Signup and view all the answers

At which view do we primarily grade a stone from when using a 10x loupe for clarity grading?

Crown up view Signup and view all the answers

What is the highest grade on the GIA Clarity Scale?

"IF" - Internally Flawless Signup and view all the answers

"What is the main factor considered when grading diamonds for their fluorescence intensity under Long Wave (LWUV)?"

Intensity of fluorescence Signup and view all the answers

What are some observations used to determine the ID of a stone in non-lab testing?

Observations include lustre, cut quality, indications of hardness, girdle condition, inclusions, and surface features. Signup and view all the answers

What tests can be conducted with the Thermal conductance probe and Electrical conductance probe in non-lab testing?

The Thermal conductance probe and Electrical conductance probe can be used to test diamonds for their thermal and electrical properties. Signup and view all the answers

How does a Polariscope aid in the testing of diamonds?

Polariscopes reveal patterns in the stone, helping to determine the stone's optical nature and whether it is natural or synthetic. Signup and view all the answers

What does the Tatami strain pattern indicate in diamonds when viewed using a Polariscope?

The Tatami strain pattern indicates Type II diamonds, which could be natural, treated, or synthetic. Signup and view all the answers

How can crossed polarizing filters help in identifying synthetic diamonds?

Crossed polarizing filters can reveal strain patterns in diamonds, aiding in the identification of synthetic diamonds. Signup and view all the answers

What is the significance of plastic deformation in diamonds when viewed under crossed polars?

Diamonds with plastic deformation show high levels of strain under crossed polars. Signup and view all the answers

What are the observations for metallic inclusions in HPHT synthetic diamonds?

Hour glass/ Maltese cross colour zoning Signup and view all the answers

What are the observations for clarity treatments involving fracture filling?

Colour flashes, gas bubbles in glass Signup and view all the answers

How can laser inscriptions be identified on diamonds?

Certificate number lasered onto the girdle Signup and view all the answers

What is the purpose of the DTC DiamondSure Portable?

To identify natural diamond vs. synthetics and simulants Signup and view all the answers

How does the DTC DiamondView determine natural or synthetic diamonds?

Use of ultra-SWUV light and fluorescent patterns Signup and view all the answers

What are the distinctive growth patterns for HPHT synthetic diamonds?

Cubo - Octahedral patterns Signup and view all the answers

What types of diamonds can be detected based on their growth patterns and fluorescence?

CVD and natural Type II diamonds Signup and view all the answers

What is the basis for identifying diamond types using specialized screening equipment?

Type I diamonds absorb SWUV light, Type II diamonds transmit it Signup and view all the answers

What does the Cathodoluminescence (CL) test assess in diamonds?

Fluorescent patterns and distinctive growth patterns Signup and view all the answers

How can the presence of synthetic moissanite be detected using the DTC DiamondSure Portable?

If it does not have the absorption line at 415.2nm Signup and view all the answers

Assessing Diamond Value: The Four C's

Questions and Answers

What is the standard weight of a carat in grams?

What is the equivalent weight of 100 points in carats?

How are small diamonds under approximately 0.20ct often referred to?

What does a diamond graded as 'D' signify in terms of color?

What is the method used for grading fancy colors in diamonds?

What is the main factor considered for grading fancy colors in diamonds?

Which factor may make the CZ master stones less accurate for estimating the colour-group grade?

Why is it NOT POSSIBLE to accurately colour grade a mounted diamond?

What are fancy coloured diamonds graded for?

Which factor may influence the colour of a diamond seen in daylight if it is strongly fluorescent?

What do we primarily grade for when using dark-field illumination/edge of the light beam during clarity grading?

What is the nature of a 'feather' in a diamond, and how does it affect the stone?

At which view do we primarily grade a stone from when using a 10x loupe for clarity grading?

What is the highest grade on the GIA Clarity Scale?

"What is the main factor considered when grading diamonds for their fluorescence intensity under Long Wave (LWUV)?"

What are some observations used to determine the ID of a stone in non-lab testing?

What tests can be conducted with the Thermal conductance probe and Electrical conductance probe in non-lab testing?

How does a Polariscope aid in the testing of diamonds?

What does the Tatami strain pattern indicate in diamonds when viewed using a Polariscope?

How can crossed polarizing filters help in identifying synthetic diamonds?

What is the significance of plastic deformation in diamonds when viewed under crossed polars?

What are the observations for metallic inclusions in HPHT synthetic diamonds?

What are the observations for clarity treatments involving fracture filling?

How can laser inscriptions be identified on diamonds?

What is the purpose of the DTC DiamondSure Portable?

How does the DTC DiamondView determine natural or synthetic diamonds?

What are the distinctive growth patterns for HPHT synthetic diamonds?

What types of diamonds can be detected based on their growth patterns and fluorescence?

What is the basis for identifying diamond types using specialized screening equipment?

What does the Cathodoluminescence (CL) test assess in diamonds?

How can the presence of synthetic moissanite be detected using the DTC DiamondSure Portable?

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