Loose Diamond Definitions: T

Table-A term referring to the quality of the fashioning of a gemstone. The balance of the outline shape and the precision of the facet arrangement are considered in the symmetry grade

Tone-An attribute of color that determines its lightness or darkness of shading.

Top Cape-An early trade term still used by some dealers to designate the diamond color grade between crystal and cape in the river-to-light-yellow system. Small stones in this range will face up colorless when mounted, but larger stones will have a yellow tint.

Toughness-The ability of a mineral or gemstone to resist breakage. Toughness is not the same as the hardness of a stone.

Transparency-The ability of a substance to transmit light.

Treated Diamond-A diamond with a body color induced by some form of artificial irradiation, often in conjunction with controlled heating.

Treated Gems-A general term used to described gemstones that have been artificially modified to improve their color or clarity.

Trillion-A triangular shaped and faceted gemstone.

Twin Crystals-Two or more mineral crystals that have grown together in a symmetrical nature, usually nonparallel. Sometimes called twinned crystals.

Twinning Lines-Visible line on or with in a fashioned diamond, caused by twinning in the crystal.

Twinning Wisp-A cloudy area produced by crystal structure distortion, usually associated with twinning planes.

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