Kub yog cov hlau muaj txiaj ntsig, yog li nws feem ntau ua raws cov khoom cuav thiab cov hlau sib xyaw. Los ntawm cov txheej txheem thoob ntiaj teb, txhua yam uas muaj tsawg dua 41.7%, lossis 10 karats ntawm kub yog suav tias yog kev dag. Yog tias koj xav tsis thoob tias koj cov kub yog qhov tseeb, qhov kev ntsuas uas ntseeg tau tshaj plaws yog coj nws mus rau tus pov thawj pov thawj cov pov haum. Yog tias koj tseem tsis tau npaj yuav ua li ntawd, koj tuaj yeem tsim qhov kev xav los ntawm kev tshuaj xyuas qhov kub thiab ntsuas nws cov khoom siv yooj yim. Koj kuj tseem tuaj yeem sim ua qhov ntsuas nrawm lossis ntsuas nitric acid kom raug ntau dua. Mus dhau ntau qhov kev sim thiab, yog tias lawv txhua tus tawm los zoo, koj tuaj yeem so kom paub tseeb tias koj cov khoom yog qhov kev pom zoo tiag tiag.
Cov kauj ruam
Txoj Kev 1 ntawm 4: Ua Kev Pom Pom Pom Pom
Kauj Ruam 1. Nrhiav tus lej zauv cim rau ntawm kub
Cov npav, lossis tus cim, qhia koj tias feem pua ntawm cov kub ib yam khoom suav nrog. Cov cim tseem ceeb feem ntau luam tawm ntawm cov hniav nyiaj hniav kub lossis cov hlua sab hauv ntawm cov nplhaib. Feem ntau nws pom ntawm cov npib saum toj thiab pob zeb. Lub thwj cim yog tus lej ntawm 1 txog 999 lossis 0K txog 24K nyob ntawm seb hom kev muab qhab nia twg tau siv.
- Siv lub iav tsom iav los pab koj txheeb xyuas tus yam ntxwv. Nws tuaj yeem nyuaj ua los ntawm qhov muag, tshwj xeeb tshaj yog ntawm cov khoom me me ntawm cov kub xws li cov nplhaib.
- Cov hniav qub qub tej zaum yuav tsis pom cov cim. Qee lub sij hawm tus yam ntxwv ua rau lub sijhawm dhau los, thaum lwm qhov xwm txheej cov hniav nyiaj hniav kub yeej tsis tau txais lub thwj cim. Kev kos npe tau dhau los ua xyoo 1950 hauv qee thaj chaw, tab sis hauv Is Nrias teb piv txwv, nws tsuas yog yuav tsum tau ua hauv xyoo 2000.
Kauj Ruam 2. Siv tus lej cim los txiav txim seb muaj pes tsawg kub hauv koj daim
Cov nyiaj npib thiab cov hniav nyiaj hniav kub feem ntau tsis yog kub kub, yog li lawv muaj lwm cov hlau sib xyaw ua ke. Tus lej ntsuas tus lej siv hauv Tebchaws Europe khiav ntawm 1 txog 999 nrog 999 lub ntsiab lus kub ntshiab. Tebchaws Asmeskas siv ntsuas los ntawm 0 txog 24K, qhov twg 24K yog kub dawb huv.
- Tus lej ntsuas tus lej yog nyeem tau yooj yim dua li kab ke ntsuas kev ntsuas. Piv txwv li, qhov ntsuas ntawm 375 txhais tau tias koj cov khoom suav nrog 37.5% kub.
- Tus nab npawb txhais li cas kub yog nyob ntawm lub tebchaws koj nyob. Hauv Asmeskas, piv txwv li, txhua yam 9K thiab qis dua tsis suav tias yog kub, txawm tias 9K txoj hlua tes muaj 37.5% kub.
- Cov khoom cuav tuaj yeem muaj cov cim ua rau lawv saib qhov tseeb, yog li tsis txhob mus rau ntawm tus cim tshwj tsis yog koj paub tseeb tias koj tuav kub.
Kauj Ruam 3. Txheeb xyuas ib tsab ntawv cim qhia tias kub tsis dawb huv
Qee qhov ntawm cov tsiaj ntawv uas koj tuaj yeem pom yog GP, GF, thiab GEP. Cov ntawv no qhia tias koj cov nyiaj kub tau plated, uas txhais tau hais tias tus kws tsim khoom muab cov txheej kub me me rau ntawm lwm cov hlau, xws li tooj liab lossis nyiaj. Koj cov khoom muaj qee qhov kub hauv nws, tab sis nws tsis suav tias yog kub tiag.
- GP sawv cev rau kub plated, GF txhais tau tias kub puv, thiab GEP txhais tau tias kub electroplate.
- Cov cim sib txawv me ntsis nyob ntawm qhov kub yog los ntawm qhov twg. Piv txwv li, kub los ntawm Is Nrias teb muaj daim duab peb sab me me cim qhia rau tsoomfwv pawg thawj coj saib xyuas lub luag haujlwm. Tom qab ntawd nws muaj tus lej ntsuas thiab tus lej cim, xws li K, rau cov hniav nyiaj hniav kub.
Kauj Ruam 4. Nrhiav ib qho kev hloov pauv uas pom tau tias qhov kub tau ploj mus
Kub zoo nkauj heev rau cov hlau, yog li plated kub feem ntau rub tawm mus raws sijhawm. Qhov chaw zoo tshaj los tshuaj xyuas yog nyob ib ncig ntawm cov hniav nyiaj hniav kub thiab cov nyiaj npib. Cov pob no feem ntau rub tawm tsam koj cov tawv nqaij thiab khaub ncaws txhua hnub. Yog tias koj pom cov hlau sib txawv hauv qab cov kub, koj paub tias koj cov khoom tau plated thiab tsis suav tias yog kub tiag.
Piv txwv li, cov xim xim yuav qhia txog nyiaj lossis titanium. Cov xim liab yuav txhais tau tias tooj liab lossis tooj dag
TSWV YIM TSHUAJ
Jerry Ehrenwald
President, International Gemological Institute & Graduate Gemologist Jerry Ehrenwald, GG, ASA, is a graduate gemologist in New York City. He is the previous President of the International Gemological Institute and the inventor of U. S.-patented Laserscribe℠, a means of laser inscribing onto a diamond a unique indicia, such as a DIN (Diamond Identification Number). He is a senior member of the American Society of Appraisers (ASA) and is a member of the Twenty-Four Karat Club of the City of New York, a social club limited to 200 of the most accomplished individuals in the jewelry business.
Jerry Ehrenwald
President, International Gemological Institute & Graduate Gemologist
Our Expert Agrees:
Suspicious marks and discolorations around the edges of the item are often telltale signs that the gold is fake. However, if the item is not 24k gold, which is considered pure gold, it may tarnish over time as the base metals are exposed to oxygen.
Kauj Ruam 5. Nco tseg ib qho kev hloov pauv ntawm koj cov tawv nqaij los ntawm kev hnav lossis tuav cov kub
Cov kub ntshiab tsis hnov mob nrog hws lossis roj los ntawm koj cov tawv nqaij, yog li yog tias koj pom cov xim dub lossis ntsuab, lawv yog los ntawm lwm yam hlau. Nyiaj tawm tom qab cov cim dub thiab tooj liab tawm tom qab cov cim ntsuab. Yog tias koj pom ntau ntawm cov cim no ntawm koj cov tawv nqaij, koj cov kub yuav tsis dawb huv dua li qhov koj xav tau.
Nco ntsoov tias feem ntau cov khoom kub yog sib xyaw kub thiab lwm yam hlau. Txawm tias qee yam zoo li 14K daim ntawm cov hniav nyiaj hniav kub, 58.3% kub, tuaj yeem tso cov cim no. Siv lwm qhov kev sim ib yam kom ntseeg tau tias koj cov kub yog qhov tseeb
Txoj Kev 2 ntawm 4: Xeem Magnetism thiab Lwm Yam Khoom Yooj Yim
Kauj Ruam 1. Muab kub tso rau hauv lub thoob dej kom pom tias nws puas
Tau ntim loj txaus kom tuav tau ob qho dej thiab kub uas koj xav sim. Cov dej kub koj siv tsis muaj teeb meem tiag tiag, yog li dej sov yog qhov zoo. Cov kub kub tiag tiag yog cov hlau tuab, yog li nws ntog ncaj qha mus rau hauv qab ntawm lub jug. Imitation kub yog sib zog dua thiab ntab.
Cov kub kub tiag tiag kuj tsis xeb lossis xeb thaum ntub, yog li yog tias koj pom qhov xim tsis zoo, tej zaum koj tau plated kub
Kauj Ruam 2. Tuav tus hlau nplaum kom ruaj kom pom tias cov kub lo rau nws
Rau qhov kev xeem no, koj xav tau cov hlau nplaum muaj zog uas tuaj yeem rub txawm tias cov hlau sib xyaw. Tsiv cov hlau nplaum hla qhov kub thiab saib seb nws ua li cas. Kub tsis yog hlau nplaum, yog li tsis txhob dag los ntawm ib yam dab tsi uas lo. Yog hais tias cov hlau nplaum rub cov kub rau nws, koj cov khoom yog yam tsis huv lossis cuav.
- Cov hlau nplaum hauv chav ua noj tsis tu ncua yuav tsis ua. Yuav cov hlau nplaum neodymium muaj zog los ntawm khw muag khoom txhim kho hauv tsev.
- Kev ntsuas hlau nplaum tsis yog kev dag, vim tias kub cuav tuaj yeem ua nrog cov hlau tsis muaj hlau nplaum zoo li hlau tsis huv. Tsis tas li, qee qhov khoom kub tiag yog ua nrog cov hlau sib nqus xws li hlau.
Kauj Ruam 3. Rub cov kub rau ntawm cov nplais uas tsis pom kev kom pom tias nws tawm ib txoj kab
Nco ntsoov tias koj tab tom siv cov iav uas tsis muaj qhov tsis zoo vim tias txhua yam uas muaj glaze tuaj yeem cuam tshuam rau cov txiaj ntsig ntsuas. Luag koj cov khoom hla lub phaj kom txog thaum koj pom qee qhov tawg los ntawm cov kub. Yog tias koj pom cov kab dub, qhov ntawd txhais tau tias koj cov kub tsis muaj tiag. Ib txoj hlua kub feem ntau qhia txog qhov tseeb kub.
- Sim ua cov nplais pobzeb uas tsis ci los yog phaj hauv online lossis los ntawm koj lub khw txhim kho tsev.
- Qhov kev sim no khawb qhov kub me ntsis tab sis tsis feem ntau ua rau pom kev puas tsuaj ntau. Nws muaj kev nyab xeeb ntau dua li lwm qhov kev ntsuas cuam tshuam nrog khawb lossis kua qaub.
- Lwm txoj hauv kev los ua qhov no yog los ntawm kev nthuav tawm qee lub hauv paus zoo nkauj ntawm koj cov tawv nqaij thiab rub cov kub hla nws tom qab nws qhuav. Fake kub feem ntau cuam tshuam nrog lub hauv paus, tawm hauv qhov ntsuab lossis xim dub hauv nws.
Txoj Kev 3 ntawm 4: Ua Kev Xeem Density
Kauj Ruam 1. Ntsuas koj cov nyiaj kub ntawm qhov ntsuas
Yog tias koj muaj chav ua noj tsim nyog, tso cov kub rau nws. Txwv tsis pub, cov hniav nyiaj hniav kub thiab cov neeg ntsuas feem ntau tuaj yeem ua nws rau koj dawb. Hu ib ncig mus rau cov khw muag khoom sib txawv lossis kev tshuaj ntsuam xyuas kom pom cov twg muab cov kev pabcuam no. Nco ntsoov tias koj tau txais qhov hnyav hauv grams ntau dua li ooj.
Koj xav tau qhov hnyav hauv grams los siv hauv kev suav tom qab. Yog tias qhov hnyav nyob hauv ooj, koj yuav tsis tau txais qhov txiaj ntsig raug
Kauj Ruam 2. Ua kom tiav lub tog raj kheej ib nrab nrog dej
Xaiv lub tog raj kheej uas loj txaus los tuav cov kub. Nws yuav tsum muaj cov cim ntsuas hauv milliliters (mL) lossis cubic centimeters (cc). Yog tias koj tsis muaj lub tog raj kheej kawm tiav tas li, koj tuaj yeem sim siv lub khob ntsuas chav ua noj.
- Cov vials uas muaj cov cim ntau ntau mm nyob rau sab yog qhov muaj txiaj ntsig kom tau txais kev ntsuas raug ntau dua thaum ntsuas.
- Tus nqi dej uas koj siv tsis muaj teeb meem ntau npaum li koj tso ntau qhov chaw rau kub. Yog tias koj ntim lub vial mus rau saum, tso cov kub rau hauv nws ua rau cov dej nchuav.
Kauj Ruam 3. Nyeem qib pib dej hauv lub tog raj kheej
Saib cov cim ntawm lub tog raj kheej, tom qab ntawd sau cov qib dej. Qhov ntsuas no tseem ceeb heev rau kev xeem, yog li sau nws. Nco ntsoov tias koj muaj lub vial ntawm lub tiaj tiaj, qib saum npoo kom thiaj li tau txais kev nyeem ntawv raug raws li qhov ua tau.
Nco ntsoov tias nws tsis muaj teeb meem yog tias koj lub vial tau cim hauv milliliters lossis cubic centimeters. Lawv yog qhov ntsuas tib yam, yog li ib chav twg tuaj yeem siv rau hauv qhov kev xeem
Kauj Ruam 4. Muab cov kub tso rau hauv lub raj mis thiab sau cov dej tshiab
Maj mam txo cov kub rau hauv lub tog raj kheej kom tsis txhob poob dej. Tso ntawm nws sab xis saum dej kom tiv thaiv tsis tau los yog ua rau koj cov ntiv tes ntub. Tom qab ntawd, nyeem cov cim ntxiv kom tau txais qhov ntsuas thib ob.
Sau qhov ntsuas thib ob ntawm ib daim ntawv. Nco ntsoov tias qhov no yog qhov ntsuas thib ob, tsis yog thawj qhov ntsuas
Kauj Ruam 5. Tshem tawm qhov ntsuas kom pom qhov sib txawv ntawm qib dej
Ua qhov kev xam yooj yim los xam seb dej ntau npaum li cas cov kub pauv mus. Rho tawm qhov ntsuas thawj zaug, tus lej me dua, los ntawm qhov ntsuas kawg. Qhov no muab koj cov lus teb hauv milliliters lossis cubic centimeters, nyob ntawm seb ntsuas dab tsi koj cov npe vial.
Piv txwv li, yog tias koj pib nrog 17 mL (0.57 fl oz) ntawm cov dej uas tau nce mus rau 18 mL (0.61 fl oz), uas tawm ntawm 1 mL (0.034 fl oz) qhov sib txawv
Kauj Ruam 6. Sib faib qhov hnyav qhov kub los ntawm qhov sib txawv hauv qib dej
Qhov ntom ntawm cov kub sib npaug nws qhov hnyav faib los ntawm nws qhov ntim. Tom qab suav qhov ntom ntom, sib piv cov txiaj ntsig rau tus qauv ntom ntawm kub, uas yog 19.3 g/mL. Yog tias koj tus lej nyob deb, muaj feem yuav koj muaj tus cuav. Nco ntsoov, txawm li cas los xij, qee qhov sib xyaw ua ke ntawm cov hlau hauv cov kub cuav tuaj yeem muaj qhov ntom zoo ib yam li kub tiag.
- Piv txwv li, koj muaj cov khoom kub uas hnyav 38 g (1.3 oz) thiab tshem tawm 2 mL (0.068 fl oz) dej. Sib faib 38 los ntawm 2 kom tau 19 g/ml, uas yog ze rau qhov ntom ntawm kub.
- Tus qauv ntom ntom sib txawv me ntsis nyob ntawm seb hom kub koj muaj. Rau 14k daj kub, nws yog li 12.9 txog 13.6 g/ml. Rau 14K dawb kub, nws nyob ib ncig ntawm 14 g/ml.
- Ib qho ntawm 18K daj daj muaj qhov nruab nrab ntom ntawm 15.2 txog 15.9 g/ml. Ib qho ntawm 18K dawb kub muaj qhov ntom los ntawm 14.7 txog 16.9 g/ml.
- Ib qho 22K ib qho kub muaj qhov ntom nyob ib puag ncig 17.7 txog 17.8 g/mL.
Txoj Kev 4 ntawm 4: Siv Tshuaj Nitric Acid Test
Kauj Ruam 1. Yuav cov khoom ntsuas kub kom tau cov kua qaub uas koj xav tau rau kev sim
Cov khoom siv ntsuas suav nrog ntau lub raj mis ntawm nitric acid rau ntau hom kub. Qee qhov kev sim kuj suav nrog pob zeb tiaj tus hu ua touchstone koj tuaj yeem siv los khawb qee qhov kub ntawm koj cov khoom. Koj kuj tseem tuaj yeem pom cov koob nrog cov qauv ntawm daj thiab dawb kub los siv ua piv rau koj cov khoom.
Cov cuab yeej ntsuas muaj nyob online. Tsis tas li, txheeb xyuas nrog cov khw muag nyiaj hauv zos. Feem ntau cov hniav nyiaj hniav kub siv qhov kev ntsuas no rau nws qhov raug
Kauj Ruam 2. Tsim qhov khawb me me ntawm qhov kub uas siv cov cuab yeej ntse
Xaiv qhov chaw uas tsis muaj qhov tshwj xeeb ntawm cov hniav nyiaj hniav kub los ua qhov khawb, xws li hauv qab cov qawm qho lossis sab hauv. Tom qab ntawd, siv cov cuab yeej ntse xws li cov hniav nyiaj hniav kub los kos rau hauv kub. Kos kom txog thaum koj tau txais hauv qab txheej txheej kub. Tshaj tawm txheej tshiab ntawm kub lossis lwm yam hlau hauv qab nws.
Kev ntsuam xyuas Nitric acid xav kom koj khawb koj daim tawv kub. Yog tias kub muaj tus kheej muaj txiaj ntsig rau koj lossis koj npaj yuav khaws nws, coj mus rau tus kws tshaj lij nyiaj txiag tsis yog ua qhov ntsuas koj tus kheej
Kauj Ruam 3. Ntxiv ib tee nitric acid rau qhov khawb
Muab cov hnab looj tes looj hnab looj tes thiab ua haujlwm hauv chav uas muaj cua nkag tau zoo kom tsis txhob muaj teeb meem nrog rau cov kua qaub. Thaum koj npaj txhij, saib lub raj mis kua qaub uas sau rau 18K kub. Tom qab teeb tsa kub hauv lub thawv hlau tsis huv, tso cov kua qaub ncaj qha rau ntawm qhov khawb koj ua, tom qab ntawd saib rau nws kom tig qhov ntxoov ntxoo ntsuab. Yog tias nws tig ntsuab, koj paub tam sim koj cov nyiaj kub yog dag.
- Cov kub tsis tu ncua tsis hnov mob rau cov kua qaub, yog li koj cov khoom yuav yog kub plated lossis qis-purity sib xyaw ntawm cov hlau.
- Cov tshuaj tiv thaiv xim mis feem ntau qhia tias yog kub-plated sterling silver. Yog tias cov kua qaub dhau los kub, koj muaj tooj liab kub plated.
Kauj Ruam 4. Khawb qhov kub ntawm lub pob zeb txhawm rau ntsuas nws qhov huv
Yog tias koj xav tias koj yuav muaj kub tiag tiag, txhuam nws nrog cov pob zeb los tsim kom muaj cov nplaim taws kub. Ntxiv qhov poob ntawm 12K, 14K, 18K, thiab 22K nitric acid mus rau qhov sib txawv ntawm qhov kev sib tw. Txheeb rov qab tom qab 20 txog 40 vib nas this. Nrhiav qhov chaw uas cov kua qaub tsis yaj cov kub kom paub seb karat ntsuas koj cov khoom yog dab tsi.
Cov kua qaub txhua lub zog ntxiv, yog li cov kua qaub siv rau 22K muaj zog dua li 12K ib qho. Yog tias 18K acid yaj cov kub tab sis 14K ib tus tsis, koj paub tias koj cov khoom tej zaum yuav nyob ib puag ncig 14K
TSWV YIM TSHUAJ
jerry ehrenwald
president, international gemological institute & graduate gemologist jerry ehrenwald, gg, asa, is a graduate gemologist in new york city. he is the previous president of the international gemological institute and the inventor of u.s.-patented laserscribe℠, a means of laser inscribing onto a diamond a unique indicia, such as a din (diamond identification number). he is a senior member of the american society of appraisers (asa) and is a member of the twenty-four karat club of the city of new york, a social club limited to 200 of the most accomplished individuals in the jewelry business.
jerry ehrenwald
president, international gemological institute & graduate gemologist
for complete peace of mind, take your gold item to a trusted industry professional to determine its authenticity.
tips
- most gold tests are imperfect, so you may need to go through several tests in order to decide if your item is authentic.
- you may have heard of the bite test where gold is real if your teeth leave a mark on it. since most gold items consist of blends of harder metals, avoid the bite test to protect your teeth.
- when jewelers say that gold is 24k, they mean that the gold is 99.9% pure with minimal traces of other metals. a piece of gold that is 22k is 22 parts gold and 2 parts another metal.
- in items that are less than 24k in quality, the other metals give the gold its hardness and color. gold on its own is very soft, so metals like silver and copper are added to make gold items more durable.
- jewelry made with white gold, yellow gold, red gold, and rose gold are all combinations of gold and other metals.
- if you ever need help determining whether gold is real, take your item to a professional jeweler or appraiser.
