to buy a diamond
to read a certificate
How to Link
Diamond Ring Buying
Guide by Renee Newman
Consumer-oriented book filled with useful information, drawings &
pictures for 1st time diamond buyer.
Photo Masters of
Diamond Grading by Gary Roskin
Photo Masters is a compilation of 244 extraordinary photomicrographs,
suitable for students or experienced diamond graders.
Blood Diamonds cost torture & death for Sierra Leone residents. Conflict
Diamonds finance civil wars & terrorists, including al Qaeda.
Antique Price Guide
By Judith Miller, author of more than 80 books on antiques, including "How
to Make Money Out of Antiques."
- Tiny nicks along facet junctions, producing white fuzzy lines instead
of sharp crisp facet edges.
- A step cut in the shape of a small rectangular stone. May be tapered
at one end.
- Bearded girdle, or Bearding:
- Tiny, numerous, hairlike fractures extending into the stone.
- Bezel :
- A facet on the Crown, or upper part of the Diamond above the Girdle.
- Surface imperfection external to the Diamond.
- Industrial grade diamonds
- Bow-Tie Effect:
- An effect caused by a shadowy area visible in some fancy shapes,
caused by light leaking out the bottom of the Diamond.
- An inclusions consisting of surface crumbling, often accompanied
by tiny, rootlike feathers .
- Burned Facet:
- This facet may appear whitish, or burnt, as a result of the cutter
polishing the facet "against the grain".
- Carat Weight:
- The metric carat, which equals 0.200 gram, is the standard unit
of weight for diamonds and most other gems. If other factors are
equal, the more a stone weighs, the more valuable it will be.
- An inclusion consisting of a large or deep opening in the stone.
- A tiny piece missing, caused by normal wear and tear, or by cutting.
- A stone's relative position on a flawless to imperfect scale. Clarity
characteristics are classified as inclusions (internal) or blemishes
(external). The size, number, position, nature, and color or relief
of characteristics determine the clarity grade. Very few diamonds
are flawless, that is, show no inclusions or blemishes when examined
by a skilled grader under 10X magnification. If other factors are
equal, flawless stones are most valuable.
- A group of tiny white inclusions which result in a milky or cloudy
- Coated Diamond:
- A diamond colored by a surface coating which masks the true body-color;
the coating may be extensive (entire pavilion, for example), but
is more often limited to one or two pavilion facets or a spot on
- Grading color in the normal range involves deciding how closely
a stone's bodycolor approaches colorlessness. Most diamonds have
at least a trace of yellow or brown bodycolor. With the exception
of some natural fancy colors, such as blue, pink, purple, or red,
the colorless grade is the most valuable.
- The upper part of the diamond above the girdle. Consists of a large
flat area on top called a table, and several facets below it.
- The smallest facet at the bottom of the diamond.
- The proportions and finish of a polished diamond (also called make).
Cut can also mean shape, as in emerald cut or marquise cut. Proportions
are the size and angle relationships between the facets and different
parts of the stone. Finish includes polish and details of facet
shape and placement. Cut affects both the weight yield from rough
and the optical efficiency of the polished stone; the more successful
the cutter is in balancing these considerations, the more valuable
the stone will be.
- Emerald cut:
- A step cut, usually rectangular.
- Extra Facet
- A facet placed without regard for symmetry and not required by the
- Plane, polished surface of a diamond.
- Faceted Girdle:
- Sometimes cutters polish the girdle into 32 facets.
- Fancy Diamond:
- A diamond with an attractive natural bodycolor other than light
yellow or light brown.
- A separation or break due to either cleavage or fracture, often
white and feathery in appearance.
- An imperfection of a stone.
- A crack on the Diamond's surface.
- The outer edge or the widest part of the diamond forming a band
around the stone.
- Grain Center:
- A small area of concentrated crystal structure distortion, usually
associated with pinpoints.
- Mineral's resistance to scratching on a smooth surface. Mohs scale of relative
hardness consists of 10 minerals, each scratching all those below
it in scale and being scratched by all those above it.
- Pure, spectral (prismatic) color. Hues include gradations and mixtures of
red, organe, yellow, green, blue, violet and purple.
- Included Crystal:
- A mineral crystal contained in a diamond.
- Imperfection internal to the Diamond.
- Internal Graining:
- Internal indiciations of irregular crystal growth. May appear milky,
like faint lines or streaks, or may be colored or reflective.
- Irradiated diamond:
- A diamond which has been exposed to radiation.
- An included diamond crystal which reaches the surface of a polished
- Laser Drill Hole:
- A tiny tube made by a laser. The surface opening may resemble a
pit, while the tube usually looks needle-like.
- Magnifying glass usually of 10X.
- Small Diamonds under .20 carat.
- Mohs scale:
- The ten-point scale of mineral hardness, keyed arbitrarily to the minerals
talc, gypsum, calcite, fluorite, apatite, orthoclase, quartz,
topaz, corundum, and diamond.
- Part of the rough Diamond remaining on the Diamond, having survived
the cutting process. This is usually the sign of a good cutter attempting
to maximize the weight retention of the rough Diamond.
- A long, thin included crystal which looks like a tiny rod.
- A notch near the girdle or a facet edge.
- A poorly proportioned Diamond.
- Old European Cut:
- Early round cut similar to the Round Brilliant Cut, but carrying
a very small table and heavy crown. Not as popular today because
it does not return the same brilliance as the modern brilliant.
- The bottom part of the Diamond, below the girdle.
- Miniscule spots internal to a Diamond. A cluster of pinpoints can
form a cloud.
- A tiny opening, often looking like a white dot.
- 100th of a carat.
- Polish Lines:
- Tiny parallel lines left by polishing. Fine parallel ridges confined
to a single facet, caused by crystal structure irregularities, or
tiny parallel polished grooves produced by irregularities in the
- Polish Mark:
- Surface clouding caused by excessive heat (also called burn mark,
or burned facet), or uneven polished surface resulting from structural
- Rough Girdle:
- A grainy or pitted girdle surface, often with nicks.
- Round Brilliant cut:
- The most common cut containing 58 facets. Also the most brilliant
cut, in terms of most efficient use of light to increase brilliance
and fire, hence the name.
- A color's position on a neutral to vivid scale.
- A linear indentation normally seen as a fine white line, curved
- Spread stone:
- A Diamond with a large table and a thin crown height.
- Surface Graining:
- Surface indication of structural irregularity. May resemble faint
facet junction lines, or cause a grooved or wavy surface, often
cross facet junctions.
- A color's position on a colorless-to-black scale.
- Treated Diamond:
- A diamond with a bodycolor induced by some form of artificial irradiation,
often in conjunction with controlled heating (known as annealing).
- Twinning Wisp:
- A cloudy area produced by crystal structure distortion, usually
associated with twinning planes.
DIAMONDS TUTORIAL NAVIGATOR
Lesson 1, The 5Cs:
Lesson 2, Shapes:
Lesson 3, Articles:
to Buy a Diamond, How
to Sell Your Jewelry,
to Read a Diamond Certificate, GIA
vs AGS Cut Grade,
the difference between a Diamond Certificate & a Jewelry Appraisal,
Largest Polished Diamonds, World's
Largest Rough Diamonds,
is the SI3 Clarity Grade?, Diamond
Lesson 4, Shop Around:
Lesson 5, Talk to the pros:
Ask a Diamond Question, Diamond