Best Sellers
Our Story
KOS is a sub-brand of CELI Jewelry, a family business brand that has been dealing with natural diamond and natural gemstone for over 50 years, established in 1975. Our experienced GIA-certified gemologists source and select only the best quality diamonds. We have over 500 laboratory-grown diamonds for you to choose from at our flagship store, covering all shapes, sizes, and quality grades.
We also have our own in-house production facility. Every piece of jewelry is made by the hands of experienced craftsmen who have accumulated expertise and meticulousness over decades from generation to generation. Every piece of jewelry must pass strict quality control before it reach to your hands.
50+ years experience
in diamond industry
Trust us for a wealth of experience in sourcing, evaluating, and delivering exceptional diamonds, making your purchase a seamless and informed decision.
Customizable
design
Unlock your unique style with our customizable design options. Tailor your choices to create a one-of-a-kind piece that reflects your taste and preferences.
In-house
Craftsmanship
Why Lab-Grown Diamonds?
Lab-grown diamonds provide ethical, cost-effective alternatives with fewer impurities and innovative designs. While conflict-free and transparent, the choice depends on individual values and budgets.
Buy now, Pay later
With
on stunning lab-grown diamonds! Sparkle and shine with ethical elegance
while enjoying flexible payment options.
GIA / IGI CERTIFIED
GIA & IGI is widely recognized for its strict grading standards and is considered a reputable source for diamond certification. The certificate serves as a reliable and independent assessment of a diamond’s quality, aiding consumers and the diamond trade in making informed decisions when buying or selling diamonds.
Rent your jewelry
Elevate your look for any occasion with our stunning jewelry pieces available for rent. Explore our selection and add a touch of elegance to your ensemble today.
Top pick rental items
Knowledge
What is Laboratory Grown diamonds?
Understanding Laboratory-Grown Diamonds: How They Differ from Natural Diamonds Diamonds have long been cherished for their unmatched brilliance, durability, and
What is the price difference between lab-grown diamonds vs Natural diamonds?
At KOS, our 1carat lab-grown diamond cost about 20,000 baht while natural diamond of the same quality cost about 200,000 baht
How can you tell if it’s lab-grown diamond or not?
Optically, you can easily distinguish CZ/Moissanite from diamond. CZ will look very white but lack liveliness, while, diamond will look very lively and have dimension. On the other hand, lab-grown diamond will look very much alike natural diamond.
Free Shipping
Free shipping for all orders over $100.00
Secure Payment
Accept Paypal, Visa, MasterCard & more
Money Back Guarantee
100% no risk shopping with 30 days refund
Latest From Kos Jewelry
