Illusion
Isla Cocktail Ring
฿269,0002.39 ct · Oval · Yellow gold
0%
Bangkok · 1993
Everyday Luxury. Timeless Brilliance.
Fine natural diamond jewellery, handcrafted since 1993.
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True luxury begins with uncompromising quality.
Founded in 1993 by Sanjay Kothari, Anju Diam Co., Ltd. was built on knowledge before craftsmanship. Beginning as a trader of loose diamonds, he spent years understanding every facet of a stone — its quality, grading, brilliance and value. That pursuit laid the foundation for what would become a trusted name in fine natural diamond jewellery.
The Collections
Five houses of work.
Each collection is built around a different problem of wear — how a ring sits, how a drop swings, how a line follows the collarbone.
1993
Founded in Bangkok
18k
Gold, never plated
G+
Colour, or higher
VS+
Clarity, or above
One From Each House
The pieces we would show you first.
A single piece from every collection, chosen for the work in it rather than the weight of the stone.
Illusion
Iris Illusion Studs
฿284,0002.19 ct · Marquise · Rose gold
Illusion
Étoile Riviere Necklace
฿925,0006.22 ct · Round Brilliant · Rose gold
Illusion
Étoile Illusion Line Bracelet
฿1,135,0007.35 ct · Marquise · Rose gold
Illusion
Iris Solitaire Pendant
฿181,0001.59 ct · Round Brilliant · Yellow gold
The House Speciality
More stone than the stone.
An illusion setting is a mirror-finished plate, cut and polished by hand, that continues the light of the diamonds sitting in it. Done well, three small stones read as one large one — and the piece carries the presence of a solitaire several times the price.
It is difficult work. The plate has to be cut to the exact girdle line of each stone, and any flaw in the polish shows immediately as a dull edge. It is also the work Anju Diam has specialised in since 1993.
Bespoke
Bring us a drawing, a photograph, or an idea.
Roughly half of what leaves the atelier was never in a collection. We work from sketches, from a stone you already own, or from a piece you would like reimagined for a different hand.
The House Hallmarks
What you are paying for, and what you are not.
Every piece is 18-karat gold, G colour or higher, VS clarity or above — and priced against its actual weight. There is no showroom markup, no premium for the name on the box, and nothing in the quote you cannot see on the certificate.
Legacy
Three decades of natural diamond knowledge, from a loose-stone trader in 1993 to the atelier today.
Purity
Natural diamonds only, never laboratory-grown. 18-karat gold throughout, never plated.
Fair Weight
Metal and stones weighed in front of you and priced to that weight. No rounding in our favour.
Quality Check
Inspected at every stage — after setting, after polishing, and again before it is boxed.
Certified
A house certificate with every piece, listing each natural stone's weight, colour, clarity and origin.
Customer Trust
Resizing, re-polishing and re-rhodium plating for the life of the piece, at cost.
The Monogram
Every piece carries the house mark, so what you own can always be traced back to us.
Still deciding?
Bring us a quote from anywhere else and we will tell you honestly whether it is a good one.
Ask us
Enquiries
Write to us.
Every piece is 18-karat gold, G colour or higher, VS clarity or above. Tell us what you are looking for and we will tell you honestly what it takes to make it.