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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
With over 50 years of experience, we take pride in our expertise in diamond jewelry. Every diamond is hand-selected by GIA-certified gemologists, and our highly trained jewelry advisors are ready to provide technical knowledge and comprehensive advice, ensuring trust and confidence in your purchase.
Customizable
design
We offer a personalized jewelry design service, allowing you to create a piece that truly reflects your individuality. By working closely with our expert team, you can customize every detail, ensuring your jewelry is as unique and special as you are.
In-house
Craftsmanship
Our in-house production guarantees meticulous attention to every detail, delivering exceptional quality in every piece. With decades of craftsmanship, we are committed to creating masterpieces that reflect both artistry and precision, tailored uniquely for you.
Why KOS Lab-Grown Diamonds?
Our Lab-grown diamonds are handpicked by GIA-certified specialists. Our technical knowhow in sourcing high-quality diamonds are second-to-none. We work very closely with only a handful of credible and ethical diamond growers, whom pass our standards, to ensure only the best diamonds are presented on our pieces.
Buy now, Pay later
With
on stunning lab-grown diamonds! Sparkle and shine with ethical elegance
while enjoying flexible payment options.
GIA & IGI CERTIFIED
All of our diamonds are certified and graded by world respected institutions, GIA & IGI, who are 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. All of our diamonds are laser-inscripted to ensure the diamond matches with the certificate.
Rent your jewelry
Elevate your special occasions with our ‘Jewelry Rental Service’. Access luxurious, certified diamond pieces at an affordable price—no purchase necessary. Perfect for weddings, galas, and more, our handpicked, crafted-to-perfection jewelry lets you shine without the commitment. Experience true elegance for a fraction of the cost.
Top pick rental items
Knowledge
How Many Rings Do You Need for a Marriage or Wedding Ceremony?
When planning a wedding, many people wonder: how many rings do you actually need for a marriage or wedding ceremony?
The 4Cs of Diamonds: Cut, Color, Clarity, and Carat
The 4Cs of Diamonds: Cut, Color, Clarity, and Carat The 4Cs—Cut, Color, Clarity, and Carat—are the globally recognized standards used
Future of Lab-grown diamonds
The Future of Diamonds: Lab-Grown Diamonds’ Role in the Jewelry Industry Diamonds have long been a symbol of love, luxury,
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