Diamond pinpoint inclusion photography by Joe Vanells, Director of Gem Services at AGSL. No reproduction without written permission from AGSL - All rights reserved.
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PINPOINT:
Minute crystals inside the diamond that look like small specks under 10X magnification. A cluster of pinpoints form a cloud. The presence of a single pinpoint inclusion can make the difference between a Flawless and a VVS1 grade.
Pinpoint inclusions are tiny dotted inclusions or crystals inside the diamond. It looks like a tiny dotes of light when viewed under high magnification.
Pinpoints: Miniscule spots internal to a Diamond. A cluster of pinpoints can form a cloud.
Tone: A color's position on a colorless-to-black scale.
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Pinpoints: areas of minute, dot-like inclusions.
Twinning Wisps: cloudy areas produced by distorted crystal growth.
Pinpoint
A Pinpoint is a small, tiny crystal that looks like little, bitty dots in the stone.
Blemishes ...
Pinpoint: An inclusion within a diamond. A gathering of pinpoints is called a "cluster" or "cloud." A cloud or cluster can appear as a hazy area in the diamond, a pinpoint appears as a dot.
Pinpoints
One of the most common inclusions, a pinpoint is a white spot that occurs within the diamond during its formation. These are tiny crystalline growths.
Point ...
pinpoints Tiny included crystals. Also see included crystals.
pipe A term for the description of a volcanic column of cooled igneous rock.
Carbon Pinpoints - The same as carbon spots but extremely small and somewhat more likely to be opaque. Return to Top » ...
Pinpoints
Small dot shaped inclusions in diamonds. Many pinpoints together form a cloud inclusion.
Pit ...
Pinpoints are very small inclusions, difficult to see at 10x magnification
Pipe ...
Fig 49 A pinpoint inclusion under the table
Fig 50 A tiny cleavage crack at the girdle, penetrating into a crown main facet
Fig 51 A pinpoint inclusion under a girdle facet ...
Pinfire or Pinpoint - very small, closely spaced, color flashes.
Mosaic or Harlequin - large (ca. 2 mm or greater), regular, angular, patches of color.
Flame - sweeping reddish bands, like a wind-blown flame.
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Typical flaws include tiny pinpoints, faint clouds, tiny feathers, or internal graining.
VS1, VS2 (very slightly included) - Very small inclusions and/or finish faults, somewhat difficult for a trained eye to see under 10x magnification.
Pinpoint: A very small crystal that appears like a dot at 10x magnification.
Needle: A thin and short crystal that looks like a rod.
Cloud: Several pinpoints lying together across various planes.
Dispersion, refers to an optical property of gemstones whereby flashes and pinpoints of spectral colors are displayed as the stone is turned in the light.
With pinpoint accuracy and a style more compelling than any fiction, the acclaimed author of Executive Orders delivers a fascinating account of the Airborne juggernaut - the people, the technology, and Airborne's mission in an ever-changing world.
The pattern can be a harlequin (patchwork), pinfire (small pinpoint circles), or flashfire (large irregular areas). Opals also come in different degrees of brightness, which adds beauty and value to the stone.
It pinpoints the discovery to a tunnel on Anthony's Nose, of which there are four. It also gives the discoverer and his position which explains how the specimens were encountered.
The patterns of play of color are described as: pinpoint, tiny dots of color spread through the stone; harlequin, angular patches of color connected in a quilt-like pattern; or flash, ...
You may prefer an opal that serenely glows with pinpoint flashes of the blues and greens of the sea and sky. Or you may fall in love with a gem that flashes broad patterns of red and yellow, with all the bright festivity of carnival in Rio.
Cloud: A cloud is a type of inclusion that is caused by a group of very small pinpoints that are tightly packed together inside of the diamond. They will typically resemble a cloud, hence the name.
Additionally, small pinpoints or feathers do not usually affect fancy colors due to the deeper coloring of the diamond. Fancy diamonds of VS or better clarity are more uncommon in nature and therefore command a greater price.
A small area of intense crystal structure distortion which usually associated with pinpoints.
Graining
Usually graining refers to internal irregular crystal growth which may appear milky like faint lines or streaks.
The colour play shows in different patterns which establish various varieties, including principally the black opal, fire opal, white opal, and water opal, and also flame opal, flash opal, harlequin opal, pinpoint opal, and hyalite.
I
INCLUSION - Internal characteristics present in gemstones. Common diamond inclusions include feathers, crystals, fractures, graining, pinpoints, and cavities.
One technique to differentiate tortoise from its imitators is to touch the surface with a hot pinpoint. Tortoise will give off a smell like burning hair, while plastic will emit an acrid chemical odor.
Translucent: Partially transparent.
Crystal inclusions are minerals that are included in the diamond. Depending on their nature, they may be colorless, redish, brownish, yellowish, greenish or black and may vary in size from a pinpoint to easily discernible crystalline inclusions.
Any of several types of clarity features which are enclosed within a host diamond and they may reach the surface. Some examples are knots, feathers, crystals, needles, clouds and pinpoints.
Knot ...
An internal imperfection or characteristic which reduces the clarity or brilliance of a gemstone. Common gemstone inclusions are feathers, crystals, fractures, needles, graining, pinpoints and cavities.
Inlay ...
fire is the most valued because the opal that shows red will also show the whole spectral colors when rotated.
The pattern of the play of color also influences value. Large flashes and broad patterns are rarer and more valuable than small pinpoint ...
First, a hole is precisely made with state-of-the-art equipment; it extends no further than it needs to, and its width is so small (about the size of a pinpoint) that a loupe or microscope is usually required to detect it.
One can almost pinpoint the period from this style of gold plated sterling pieces created. Add cabochons of Lucite and the Jelly Belly is created. Brooches were large, yet restrained design wise. Also used were whimsical pieces of carved Bakelite.
Inclusions can often be used to tell the difference between natural and synthetic gemstones, and in some types of gemstones, the inclusion can even pinpoint the source of the natural stone.
 See also: Stone, Color, Diamond, Point, Cut
  
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