naatn.

Brit.

/nɑːt/, U.S.

/nɑt/

Origin: A borrowing from Afrikaans. Etymon: Afrikaans naat.

Etymology: < Afrikaans naat (1940 or earlier in naatdiamant ), specific use of naat seam, suture < Dutch naad (ultimately < a derivative < the same base as needle n.).There is no etymological connection with knot n.¹ (compare quots. 1945, 1984).

Gem-cutting.

An irregularity in the structure of a diamond, caused by a change of direction in the grain as a result of twinning (see twinning n.² 2). Also: a diamond having such a feature; such diamonds collectively.

ΘΚΠ

society > occupation and work > materials > raw material > gem or precious stone > diamond > [noun] > irregularity in structure of diamond

naat1902

1902 G. F. Williams Diamond Mines S. Afr. xvii. 517 (table) The percentages of diamonds in the various classes... Maacles (Naats) and Flat Stones, pure and spotted, all sizes..4.3%.

?1930 J. Smit in Amsterdam Diamond Industry 30 a Every diamond workers [sic] knows that the spot where different parts of a diamond converge (naats) are enormously hard.

1939 M. Weinstein Precious & Semi-precious Stones (ed. 3) iii. 24 Some diamonds are found with a vein running across the polishing grain; this vein, commonly termed a ‘naat’, occurs more frequently in flat, triangular stones.

1945 Industr. Diamond Rev. Sept. 205/2 Knot, naat (Min.), irregularity of crystal structure in a single crystal diamond. Because the cleavage planes cannot easily be found, it is generally believed that such stones have a greater resistance to abrasion.

1962 S. Tolansky Hist. & Use of Diamond ix. 147 If changes in grain direction are encountered on a crystal (naat is the word for such a change), the impregnated wheel can readily cope.

1970 E. Bruton Diamonds xi. 190 The sawyer..has..to watch for any changes of hardness through an area of different crystallization. These naats sometimes have rope formation or spider's web formation in a stone and will turn the blade and spoil the cut.

1984 G. Davies Diamond ix. 228 These mis-oriented pieces, the ‘naats’, are analogous to knots in a piece of wood.

2000 G. M. Roach & L. C. McNally Diamond Cutter (2009) xi. 172 Somewhere around the middle [of the paper wrapper] maybe is some indication of the quality, like ‘white naats, J color’.

This entry has been updated (OED Third Edition, June 2003; most recently modified version published online March 2022).

单词	naat
释义	naatn. Brit. /nɑːt/, U.S. /nɑt/ Origin: A borrowing from Afrikaans. Etymon: Afrikaans naat. Etymology: < Afrikaans naat (1940 or earlier in naatdiamant ), specific use of naat seam, suture < Dutch naad (ultimately < a derivative < the same base as needle n.).There is no etymological connection with knot n.¹ (compare quots. 1945, 1984). Gem-cutting. An irregularity in the structure of a diamond, caused by a change of direction in the grain as a result of twinning (see twinning n.² 2). Also: a diamond having such a feature; such diamonds collectively. ΘΚΠ society > occupation and work > materials > raw material > gem or precious stone > diamond > [noun] > irregularity in structure of diamond naat1902 1902 G. F. Williams Diamond Mines S. Afr. xvii. 517 (table) The percentages of diamonds in the various classes... Maacles (Naats) and Flat Stones, pure and spotted, all sizes..4.3%. ?1930 J. Smit in Amsterdam Diamond Industry 30 a Every diamond workers [sic] knows that the spot where different parts of a diamond converge (naats) are enormously hard. 1939 M. Weinstein Precious & Semi-precious Stones (ed. 3) iii. 24 Some diamonds are found with a vein running across the polishing grain; this vein, commonly termed a ‘naat’, occurs more frequently in flat, triangular stones. 1945 Industr. Diamond Rev. Sept. 205/2 Knot, naat (Min.), irregularity of crystal structure in a single crystal diamond. Because the cleavage planes cannot easily be found, it is generally believed that such stones have a greater resistance to abrasion. 1962 S. Tolansky Hist. & Use of Diamond ix. 147 If changes in grain direction are encountered on a crystal (naat is the word for such a change), the impregnated wheel can readily cope. 1970 E. Bruton Diamonds xi. 190 The sawyer..has..to watch for any changes of hardness through an area of different crystallization. These naats sometimes have rope formation or spider's web formation in a stone and will turn the blade and spoil the cut. 1984 G. Davies Diamond ix. 228 These mis-oriented pieces, the ‘naats’, are analogous to knots in a piece of wood. 2000 G. M. Roach & L. C. McNally Diamond Cutter (2009) xi. 172 Somewhere around the middle [of the paper wrapper] maybe is some indication of the quality, like ‘white naats, J color’. This entry has been updated (OED Third Edition, June 2003; most recently modified version published online March 2022). < n.1902
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