About: ABOUT availability of precious and semi-precious gemstones calibrated for production of jewelry in series.


Diamond grading like that of other stones is based on 4 main criteria also known as the 4 C's : Color (from Dto K for white diamonds), Clarity (Purity), Cut (mainly proportions and symetry), and Carat (weight).

Just like any other luxury goods, the value of a diamond depends on:

- Beauty:
Totally subjective in theory, we must consider that only a few stones can offer medium tone with high saturation like rubies sapphires, Emeralds, Tanzanite, Green garnets, Tourmaline, spinels. When looking for a strong saturation in red or green, or blue the choice narrows itself to only precious stone and a couple of fine stones that are not very cheap.

- Durability:
Most valuable colored stones are quite high on the hardness scale.
In Thai precious stones are called "hard stones" while fine Gemstones are called "soft stones".
The quartz family like amethyst, citrine, onyx have the same hardness as sand and will get scratched easier than garnets, topaz or tourmaline. For instance we recommend using black spinel instead of black onyx for this reason, and black spinel has also a higher luster for the same price so Onyx has for advantage only its commercial and familiar name.

- Rarety:
Gemstones and crystals in general need stable conditions over a long period of time to grow, then they also need to resist transportation to the surface (primary deposits) and erosion in order to be found in secondary deposits (river beds).
Ex :
For instense the difference between red spinel (MgAL2O4) and ruby (AL2o3) is mostly the presence of Magnesium in the rocks where it is crystalizing. Once the Magnesium is all consumed the spinel will stop growing and then Ruby start growing instead if the rest of the conditions are still present.
Diamond needs a fast lava to come up otherwize the presure will be too low with high temperature and they will be consumed/transformed into graphite (grey diamonds) or they could resorb and vanish as well.
Gemstones are rare in nature and they also need to be found.



We offer a secured environment regarding the nature of the gemstones, treatments detection and diamonds grading. Single precious stones generally come with certificates (A.I.G.S Thailand for medium range stones, and G.R.S Swiss Lab for origin certificates on valuable stones).
Cost for GIA Certificate: 120 USD

We mostly use eye clean quality but we can accept requirements for loupe clean gemstones, or lower grades if required for silver jewelry.


From 0.6 mm to 0.8 mm :
  • We propose only VS or VVS quality white diamonds.
From 0.8 mm down to 0.9 mm :
  • VS or VVS quality white diamonds
  • CZ (white only).
From 1.0 mm to 1.4 mm we have :
  • Diamonds (white, black, Champaign, brown, cognac)
  • Treated colored Diamonds (green, yellow, purplish-pink, blue),
  • Ruby,
  • Sapphire (blue, green, yellow, orange, pink, white, black),
  • Tsavorite (green garnets),
  • White Topaz,
  • CZ.(all colors)


From Round1.5 mm OR princess 2x2mm AND up to 4 mm:
  • Diamonds (white, black, Champaign, brown, cognac),
  • Treated colored Diamonds (green, yellow, purplish-pink, blue),
  • Ruby,
  • Sapphire (blue, green, yellow, orange, pink, white, black),
  • Tsavorite (green garnets),
  • Tourmalines (pink, orangey-pink, green mostly),
  • Tanzanite,
  • Topaz (Swiss blue, London blue, sky blue),
  • Rhodolite Garnets (purple),
  • Mozambique Garnet (Orangey Red),
  • Peridot,
  • Diopside (deep green),
  • Amethyst,
  • Citrine,
  • Smokey Quartz.
  • CZ.(all colors)


From 4x2mm and up to 12mmx10mm in round or other shapes:
  • Tourmalines (pink, orangey-pink, green mostly),
  • Aquamarine, Blue Beryl ((try not too small for color saturation),
  • Heliodore (Yellow Beryl)
  • Tanzanite,
  • Topaz (Swiss blue, London blue, sky blue),
  • Rhodolite Garnets (purple),
  • Mozambique Garnet (Orangey Red),
  • Peridot,
  • Amethyst,
  • Citrine,
  • Smokey Quartz.
  • CZ.(all colors)

CUT-TO-FIT, CUT-TO-ORDER (large or unusual sizes)

For Fancy shapes, fancy faceting, and large stones for a given variety:
  • Tourmaline Pink, light Grades, small sizes.,
  • Tourmaline Rubelite (Red slightly included, no eye clean in larger sizes),
  • Aquamarine greenish-blue (milky),
  • Aquamarine Blue (transparent, slightly included for series),
  • Morganite (treated orangey-pink for series),
  • Topaz (Swiss blue, London blue, sky blue),
  • Amethyst,
  • Rose-de-France (purplish, very light amethyst),
  • Green Amethyst,
  • Citrine,
  • Lemon Quartz
  • Smoky Quartz,
  • Rose Quartz (milky or less milky),
  • Chalcedony (milky blue, lavender),
  • Chrysoprase or phrenite (milky green).


We can do carvings or cut inlays out of any stone, but generally we use opaque ornamental stones:
  • Mother of pearl,
  • Lapis,
  • Turquoise,
  • Labradorite,
  • Jaspers,
  • wood.
The most important concept about small stones (diamonds and colored stones) is the handling, selection and sorting for sizes and quality to fit the jewelry requirement. These tasks are creating labor costs, stock and rejections and it represents a liability as well. Therefore small diamonds selected and sorted cannot be compared in prices with wholesale prices for lots of average sizes and qualities. The difference with lot-price would be around 15% to 20% after sorting (markup for workshop excluded, this is our costs.).

The task and the liability are the same whether the stones are supplied by the customer or by a supplier. Therefore we apply the same charges of 15% to 20% on small goods provided by customers. Larger and costly stones will have the consignment fee down to 10% or 5% depending on the value. We base the value on our own estimates for similar goods if we were to provide them ourselves.
The gain for the customer is still important when providing his own stones because the margin of the workshop does not applying on the value of the materials (saving 15% to 25%) and if the customer could buy at better price than we would he can save even more..

* Imported goods to Thailand are subject to 7% VAT and 5% to 20% import tax based on the declared value depending on matérials, but matérials specific to jewelry can have their import tax waived totally or limited to 3%-5%. We will provide the custom duty documents to the customer and collect the payment before clearing customs duties to receive the goods. For small amount we might pay for custom duty and collect money later.

Our quotations are based on real labor and material costs, then we apply a margin of:
- Gold Jewelry : +20% based on our costs (which is 15% profit based on selling price to customer).
- Silver Jewelry : +33% based on our costs (which is 25% profit based on selling price to customer).

When buying large quantities the customer can accumulate up to -10% discount

Useful Links about Jewelry and Gemology

Laboratories & schools
(A.I.G.S. Laboratory)
(D.U.G. France)
Field trips in the mines
About minerals
The best seller
Mineral database
Another famous gemologist
Blog gemmology and opals
Blog gemmology and opals
Forums & Networks
The rendez-vous gemology
French equivalent
All about prices
Mostly about prices
All about everything
All about everything
Gemology Research center

This page is relative to jewelry design, wax modeling, wax printing, jewelry production and more specifically about gemstones, calibrated for setting and fancy cut. Our jewelry designers working by hand or on computers help in the modeling of custom jewelry. We are jewelry manufacturers in thailand making gold jewelry and silver design and production of jewelry lines in our jewelry factory. We do custom made jewelry and offer design services in order to provide a complete solution to our customers overseas.