manmade material with essentially the same physical, chemical, and optical properties as natural diamond.
manmade material made primarily of carbon forming in a different crystal system than natural diamond.
natural material that looks like diamond.
manmade material that looks like diamond.
is limited by high production costs.
is currently impossible because the synthetics are too highly included.
is limited to fancy-colored melee, which is mostly synthetic.
makes up a substantial portion of the market.
yellow or brown.
Yellow to greenish yellow under both longwave and shortwave.
Strong blue under both longwave and shortwave.
Blue under longwave and weak yellow under shortwave.
Strong yellow under longwave and none under shortwave.
High-energy electrons in a linear accelerator
give fracture-filled diamonds grades that are one grade lower than they appear to be.
grade diamonds before they fracture fill them.
only treat diamonds with eye-visible feathers.
don't grade fracture-filled diamonds.
D grade colorless
brown , orange and yellow
heat during routine repairs.
ultraviolet rays in sunlight.
chlorine in swimming pools.
ammonia in cleaning solutions.
can be determined using a DiamondSure.
cannot be determined for most diamonds.
should usually be determined by a gemological laboratory.
can be easily determined with standard gemological equipment.
Color zoning parallel to facet junctions
Etched or frosted naturals
become permanent clarity characteristics.
usually reduce the clarity grade.
aren't permanent, so major labs won't grade them.
don't need to be disclosed to customers.
distinctive color zoning.
blue or blue-green colors.
usually green or dark green colors.
only shallow penetration of the color.
has undergone HPHT treatment.
選擇要在Apple App Store上查看的Topgrade應用程序。