Kunlun Knowledge Base
Expert answers for Jewelers, Wholesalers, and Designers.
Technology & Quality (HPHT vs CVD)
Why is HPHT preferred over CVD for D-E color diamonds?
Does Kunlun HPHT diamond have blue nuance?
Is HPHT harder than natural diamond?
Can I test HPHT diamonds with a pen tester?
Why do you recommend HPHT for melee (small) diamonds?
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Pricing & Wholesale Economics
Why are Kunlun's prices 40% lower than US dealers?
Is there a Minimum Order Quantity (MOQ)?
Do you offer credit terms or consignment?
What is the price of 1 carat HPHT diamond?
Do you match prices with Indian suppliers?
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Logistics, Import & Taxes
What is the import duty for lab diamonds to the USA?
Do you ship to Europe (UK, France, Germany)?
How long does shipping take to New York?
Is the shipping insured?
Can you do 'Blind Drop-Shipping'?
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Custom Jewelry (OEM/ODM)
How long does it take to make a custom ring?
Can you copy a design from a photo?
What metals do you use?
Do you set melee diamonds?
Can I laser engrave my logo?
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Trust & Certification
Are your diamonds certified?
How do I verify the IGI certificate?
Why IGI and not GIA?
Do you have a conflict-free guarantee?
What is your return policy?
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Fancy Color Diamonds (Pink, Blue, Yellow)
How are pink lab diamonds grown?
Are blue lab diamonds natural looking?
Is yellow lab diamond cheaper than white?
Do you sell Fancy Vivid Pink diamonds?
Are colored lab diamonds treated?
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Diamond Shapes & Cuts
Which diamond shape looks the biggest?
What is the ideal ratio for an Oval cut?
Do you cut 'Hearts and Arrows'?
What is a 'crushed ice' cushion cut?
Is Emerald cut cheaper than Round?
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Engagement Ring Guide
How much should I spend on a lab diamond ring?
Is 18K gold better than 14K for engagement rings?
What is the most durable setting style?
Do prongs snag on clothing?
Does white gold turn yellow?
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Market Trends & Investment
Are lab diamond prices falling?
Do lab diamonds have resale value?
Is the natural diamond market crashing?
Will lab diamonds become 'cheap'?
Is LGD sustainable?
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Jewelry Manufacturing Technicals (B2B)
What shrinkage rate do you calculate for casting?
Do you do 3D printing in wax or resin?
Can you set stones in wax (Stone-in-Place)?
What is your polishing standard?
How do you handle micro-pave porosity?
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After-Sales & Care
How do I clean my lab diamond ring?
Can I use an ultrasonic cleaner?
Why does my diamond look cloudy?
What if a small side stone falls out?
How often should I check the prongs?
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