L/W Ratio For Gem Cutting: Dɛn Ne Ne Sɛnea Wɔde Di Dwuma?

Asɛmfua bi wɔ hɔ a agye din a ɛkyinkyini wɔ aboɔden abo a wotwitwa ho wiase a ɛyɛ anigye no mu, na wɔfrɛ no “L/W.” Nanso, sɛ woasusuw biribiara pɛn a, ɛfata sɛ wuhu asɛmfua yi yiye. Enti, dɛn na LW ratio kyerɛ na ɔkwan bɛn so na gem cutters de di dwuma?

Ɛnyɛ sɛ yɛbɛkɔ ne tenten ne ne tiawa no so wɔ asɛm yi mu nko, na mmom yɛbɛboa wo wɔ mfiridwuma ho afotuo a ɛfa sɛdeɛ wode L/W ratios bedi dwuma de ayɛ nea wɔatwa biara yie.

Woasiesie wo ho sɛ wobɛtwa akɔ saa faceting (ne anigye!) kwan yi mu? Biribiara a ɛsɛ sɛ wuhu fa L/W ratio ho wɔ gem cutting mu ni.

Dɛn ne L/W?

Sɛnea ebia woasusuw dedaw no, L/W yɛ asɛmfua a wɔatwa no tiaa a ɛkyerɛ “ne tenten kosi ne tɛtrɛtɛ.” Wɔ aboɔden abo a wotwitwa wiase no akyi no, nnipa a wofi asetra mu tebea horow nyinaa mu de wɔn ho to L/W susuw so de susuw nneɛma ahorow nyinaa —efi nneɛma a wɔde yɛ adwini so kosi mfɛnsere mu ayaresa so, mfiridwuma adansi nhyehyɛe so kosi akontaabu mu nsɛso a wɔde kɔmputa yɛ so. Sɛ wode w’adwene di dwuma a, wubehu sɛ ne titiriw no, wɔakyekyɛ wiase a atwa wo ho ahyia no mu ayɛ no susuw a efi ne tenten kosi ne tɛtrɛtɛ mu.

Gem cutters, (a wɔsan frɛ no Lapidaries) de L/W di dwuma de bu akontaabu mu nsusuwii pɔtee a ɛho hia na ama:

• Twitwa nsusuwso ahorow
• Yɛ aboɔden abo a wɔayɛ no sɛnea wɔpɛ
• Sua aboɔden abo

Aboɔden abo a wɔtwa fi nhwɛsode a ɛyɛ mmerɛw mu no yɛ Lapidary biara fapem, ɛno nti na ahokokwaw a wɔde bɛyɛ adwuma wɔ L/W susuw ne nsusuwii mu ho hia no. Nea edi kan no, ɛsɛ sɛ wunya ntease wɔ nea enti a ne tenten ne ne tɛtrɛtɛ ho hia, a yɛaka ho asɛm wɔ atifi hɔ no. Afei, momma yɛnkyekyɛ sɛnea L/W ratio no yɛ adwuma bere a wɔde di dwuma no pɛpɛɛpɛ.

Dɛn ne L/W Ratio no?

Bere a “L/W” kyerɛ ne tenten ne ne tɛtrɛtɛ no, L/W nsusuwii ne akontaabu mu akontaabu ankasa a wɔhwehwɛ na wɔde atwitwa aboɔden abo ayɛ no adwini ahorow a agye din. Sɛ wopɛ sɛ wubu L/W ratio a wode twitwa aboɔden abo a, ɛsɛ sɛ wosusuw milimita a ɛkyerɛ sɛnea nhwɛsode a ɛyɛ den no tenten ne ne tɛtrɛtɛ. Sɛ wonya saa metrics yi wie a, equation no yɛ mmerɛw:

• Nea edi kan no, fa aboɔden abo no tenten kyɛ ne tɛtrɛtɛ
• Nea edi hɔ no, woawie!

Afei, so na ɛno nyɛ mmerɛw? Mma nɔma ahorow a wubenya no nmmɔ wo hu. Sɛ wode nneɛma reyɛ adwuma wɔ milimita ketewaa bi mu a, ɛtaa ba sɛ wɔyɛ akontaabu te sɛ 1.67. Nhwɛso bi ni:

Ka sɛ aboɔden abo no tenten yɛ 8mm na ne tɛtrɛtɛ yɛ 6mm. Kyekyɛ 8 mu 6 na wobɛwie a wobɛnya 1.33. Saa ara na, woanya wo L/W ratio. Afei, dɛn na wubetumi de ayɛ? Asɛmmisa a ɛkyɛn so!

Gems a wobɛpaw sɛ wode L/W Ratio bɛtwa

Sɛ wunim L/W Ratio a ɛwɔ aboɔden abo mu a, ɛboa ma wɔn a wotwitwa nneɛma no nya nea wɔde bɛyɛ adwuma no ho adwene. Ebia wubesusuw sɛ wode L/W ratio no bedi dwuma de atwitwa ayɛ no nhwɛsode akɛse a ɛyɛ mmerɛw, nanso, ɛnyɛ bere nyinaa na eyi te saa. Mpɛn pii no, wobɛpaw aboɔden aboɔ nhyehyɛɛ a egyina aboɔden aboɔ a wopɛ sɛ wobɔ no L/W ratio so.

Akwankyerɛ ahorow bi a ɛboa a wɔde paw aboɔden abo a wɔayɛ sɛnea L/W nsusuwii te ni:

• Paw nsusuwii ahorow a ɛwɔ L/W ratio a wɔahyɛ da ayɛ
• Bere nyinaa paw adwini a ne ratio sua sen wo L/W ratio
• Anaasɛ, paw nhyehyɛe a L/W ratio yɛ pɛ ne wo rough specimen

Susuw ho saa kwan yi so: wubetumi atwitwa nneɛma a ɛboro so bere nyinaa na ama L/W nsusuwii ketewaa bi ahyia, nanso wuntumi mfa nneɛma nka ho sɛnea ne kɛse bɛyɛ nea ɛfata. Ntease wom?

Nokwarem no, metrics betumi ayɛ kɛse te sɛ aboɔden abo no ankasa, ɛno nti na ɛboa ma wɔte gyinapɛn, ne nea ɛnyɛ gyinapɛn, L/W nsusuwii ase. Ne nyinaa akyi no, ɛda adi sɛ wode abien no afrafra bɛyɛ adwuma bere a woreyɛ adwini foforo na wode nea wɔtaa de ayɛ adwuma no.

L/W Ratios a Ɛyɛ Standard Sen Biara

Sɛ wode aboɔden aboɔ nhyehyɛɛ yɛ adwuma a, wobɛhunu sɛ metrics no ne standard L/W ratios no hyia. Sɛ wɔannyɛ saa a, ɛsɛ sɛ wobɔ adwini a ɛnyɛ nea ɛfata, a yɛbɛka ho asɛm akɔ akyiri wɔ ase ha. Ma atirimpɔw a ɛwɔ susudua biara mu ntra w’adwenem:

• Ratio, sɛnea yɛaka no, kyerɛ aboɔden abo tenten a wɔakyekyɛ mu denam ne tɛtrɛtɛ so.
• Trɛw kyerɛ aboɔden abo no tenten a wɔde ne nsusuwii kyekyɛ mu.
• Ne tenten ne aboɔden abo no trɛw a wɔde ne nsusuwii abɔ ho no yɛ pɛ.

L/W ratio a wɔahyɛ da ayɛ no gu akuw abiɛsa mu: Ovals ne rectangles, marquise ne pear. Momma yɛnhwɛ emu biara!

Oval ne Rectangle a ɛyɛ ahinanan

Sɛ woakɔhwehwɛ aboɔden abo anaa agude sotɔɔ biara mu a, wunim sɛnea aboɔden abo a ɛyɛ ahinanan ne ahinanan agye din no ankasa. Sɛnea ɛte no, wobɛpɛ sɛ wuhu L/W nsusuwii a wɔahyɛ da ayɛ no yiye, a ɛne:

• 3x5 = 1.67 na ɛwɔ hɔ
• 4x6 = 1.50 na ɛwɔ hɔ
• 5x7 = 1.40 na ɛwɔ hɔ
• 6x8 = 1.33 na ɛwɔ hɔ
• 7x9 = 1.29 na ɛwɔ hɔ
• 8x10 = 1.25 na ɛwɔ hɔ
• 10x14 = 1.40 na ɛwɔ hɔ
• 12x16 = 1.33 na ɛwɔ hɔ

Marquise na ɔkyerɛwee

Aboɔden abo foforo a wɔatwa a agye din ne marquise nsusuwii a ɛyɛ fɛ , a mpɛn pii no ne L/W ratio ketewaa bi sen oval, ahinanan, ne pears. Esiane ne nsusuwii soronko nti, L/W nsusuwii dodow no ara yɛ pɛ, gye 3x5 tenten-ne-trɛw.

• 2x4 = 2.0 na ɛwɔ hɔ
• 2.5x5 = 2.0 na ɛwɔ hɔ
• 3x5 = 1.67 na ɛwɔ hɔ
• 3x6 = 2.0 na ɛwɔ hɔ
• 4x8 = 2.0 na ɛwɔ hɔ
• 5x10 = 2.0 na ɛwɔ hɔ
• 6x12 = 2.0 na ɛwɔ hɔ
• 7x14 = 2.0 na ɛwɔ hɔ

Aprɛ

Hena na ɔmpɛ pears abien? Wiɛ, ebia eye sɛ wubefi ase de L/W ratio a ɛyɛ aboɔden abo biako, nanso ɛnyɛ den sɛ wode L/W ratio no bɛyɛ pear aboɔden abo abien. Nkyɛmu a wɔahyɛ da ayɛ ma aboɔden abo a wɔatwitwa pear ni :

• 3x5 = 1.67 na ɛwɔ hɔ
• 4x6 = 1.50 na ɛwɔ hɔ
• 5x7 = 1.40 na ɛwɔ hɔ
• 5x8 = 1.60 na ɛwɔ hɔ
• 6x9 = 1.50 na ɛwɔ hɔ
• 7x10 = 1.43 na ɛwɔ hɔ

Na Nkyɛmu a Ɛnyɛ Gyinapɛn nso ɛ?

Anigye sɛ wubisae! Nea ɛnte sɛ L/W ratios a wɔahyɛ da ayɛ no, ɛsɛ sɛ wosakra nhyehyɛe bi ma L/W ratios a ɛnyɛ standard. Nea enti a ɛte saa ne sɛ gyinapɛn ratios no ka aboɔden abo a wɔatwitwa ne nhyehyɛe a agye din sen biara no nyinaa ho. Ɔkwan foforo so no, sɛ wode gyinapɛn ahorow di dwuma a, wubetumi ahyɛ bɔ sɛ agude ne adwumfo dodow no ara kura nhyehyɛe ahorow a wɔretwɛn ara kwa sɛ wobekura wo aboɔden abo no.

Nanso, gua kɛse bi wɔ hɔ ma L/W ratios a ɛnyɛ gyinapɛn, na ɛno yɛ ma wɔn a wɔpɛ biribi a ɛyɛ mfitiasede koraa na ɛyɛ biako. Ma ɛntra w’adwenem sɛ ebehia sɛ woyɛ adwuma pii wɔ anim, nanso nea ebefi mu aba awiei koraa no bɛyɛ aboɔden abo a ɛnte sɛ ɔbo foforo biara!

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