Diamonds and Diamond Grading
questions and answers
What describes the distance that's clear and sharp above and below a focus
point?✔✔depth of field
What type of loupe has been corrected for color distortion and linear
distortion?✔✔Triplet
What do clarity characteristics help determine?✔✔Identity
What are diamond's inclusions and blemishes called?✔✔Clarity characteristics
What is the abbreviation for a tiny crystal that looks like a very small dot at
10x?✔✔Pp
What does chromatic aberration cause?✔✔Rainbow effect at edges of lens
What magnification is used to assess clarity characteristics' visibility?✔✔10x
What clarity characteristic is caused by treatment?✔✔Laser drill-hole
What is an advantage of a loupe versus a microscope in clarity
grading?✔✔Portability
Where does light enter a stone in darkfield illumination?✔✔Side
What type of characteristic is in focus while the surface is out of focus?✔✔Inclusion
What are the two types of inclusions?✔✔Totally enclosed and surface-reaching
Which factor of clarity characteristics can influence a diamond's clarity
grade?✔✔Size
What clarity grade are diamonds with minor inclusions difficult to somewhat easy to
see under 10x?✔✔VS1 or VS2
What describes the nature of a clarity characteristic?✔✔type
What must be listed first on the Key to Symbols?✔✔Laser Drill-Holes
What is an advantage of the GIA clarity grading system?✔✔Uniform evaluation
Where is a feather that reaches both the crown and pavilion plotted?✔✔On both the
crown and pavilion diagrams
, What clarity range can have inclusions visible to the unaided eye?✔✔Included
What are clarity characteristics that don't affect the clarity grade called?✔✔Non-
callable
What is a plot?✔✔Map of clarity characteristics
What best describes the clarity characteristics in SI1 and SI2 stones?✔✔Noticeable
What would disqualify a stone from being graded IF?✔✔Pinpoint
What is considered in addition to the five factors when assigning a clarity
grade?✔✔Diamond size and shape
What is most efficient for systematic examination during clarity
grading?✔✔Microscope
What has more effect on the clarity grade of a diamond?✔✔Deep feather
What should be included when judging the number of clarity
characteristics?✔✔reflections
What is used to determine the final clarity grade?✔✔Loupe
What does each letter grade in the GIA Color Scale represent?✔✔Range of color
How can a very deep pavilion affect color appearance of a diamond?✔✔Darken
What is the term for a colored diamond's fundamental color?✔✔Characteristic color
What surface is optimal for color grading diamonds?✔✔White, non-reflective
What color is predominant in the "orange-yellow" hue of the GIA system?✔✔Yellow
What color grades have the largest difference in price, with all other factors
equal?✔✔D and E
What components make up depth of color?✔✔Tone and saturation
What is a term that describes hue?✔✔Yellow
What does a D-to-Z masterstone represent?✔✔Least color in range
What describes the darkness or lightness of a color?✔✔Tone
What results from slight color differences in colored diamonds?✔✔Large effect on
value
questions and answers
What describes the distance that's clear and sharp above and below a focus
point?✔✔depth of field
What type of loupe has been corrected for color distortion and linear
distortion?✔✔Triplet
What do clarity characteristics help determine?✔✔Identity
What are diamond's inclusions and blemishes called?✔✔Clarity characteristics
What is the abbreviation for a tiny crystal that looks like a very small dot at
10x?✔✔Pp
What does chromatic aberration cause?✔✔Rainbow effect at edges of lens
What magnification is used to assess clarity characteristics' visibility?✔✔10x
What clarity characteristic is caused by treatment?✔✔Laser drill-hole
What is an advantage of a loupe versus a microscope in clarity
grading?✔✔Portability
Where does light enter a stone in darkfield illumination?✔✔Side
What type of characteristic is in focus while the surface is out of focus?✔✔Inclusion
What are the two types of inclusions?✔✔Totally enclosed and surface-reaching
Which factor of clarity characteristics can influence a diamond's clarity
grade?✔✔Size
What clarity grade are diamonds with minor inclusions difficult to somewhat easy to
see under 10x?✔✔VS1 or VS2
What describes the nature of a clarity characteristic?✔✔type
What must be listed first on the Key to Symbols?✔✔Laser Drill-Holes
What is an advantage of the GIA clarity grading system?✔✔Uniform evaluation
Where is a feather that reaches both the crown and pavilion plotted?✔✔On both the
crown and pavilion diagrams
, What clarity range can have inclusions visible to the unaided eye?✔✔Included
What are clarity characteristics that don't affect the clarity grade called?✔✔Non-
callable
What is a plot?✔✔Map of clarity characteristics
What best describes the clarity characteristics in SI1 and SI2 stones?✔✔Noticeable
What would disqualify a stone from being graded IF?✔✔Pinpoint
What is considered in addition to the five factors when assigning a clarity
grade?✔✔Diamond size and shape
What is most efficient for systematic examination during clarity
grading?✔✔Microscope
What has more effect on the clarity grade of a diamond?✔✔Deep feather
What should be included when judging the number of clarity
characteristics?✔✔reflections
What is used to determine the final clarity grade?✔✔Loupe
What does each letter grade in the GIA Color Scale represent?✔✔Range of color
How can a very deep pavilion affect color appearance of a diamond?✔✔Darken
What is the term for a colored diamond's fundamental color?✔✔Characteristic color
What surface is optimal for color grading diamonds?✔✔White, non-reflective
What color is predominant in the "orange-yellow" hue of the GIA system?✔✔Yellow
What color grades have the largest difference in price, with all other factors
equal?✔✔D and E
What components make up depth of color?✔✔Tone and saturation
What is a term that describes hue?✔✔Yellow
What does a D-to-Z masterstone represent?✔✔Least color in range
What describes the darkness or lightness of a color?✔✔Tone
What results from slight color differences in colored diamonds?✔✔Large effect on
value
