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4.65 Ct. Natural Cabochon Chanthaburi Sapphire Jewellery Supplies Gems From Thailand

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Color : Yellow
Product Name : Natural Chanthaburi Sapphire
Quantity : 1
Weight : 4.65 Ct.
Dimension : 10.5 x 7.8 x 5.1 mm.
Shape/Cut : Cabochon / Mixed
Hardness : 9.0
Specific Gravity : 3.9-4.1
Refractive Index : 1.76-1.78
Treatment : Heated
Origin : Chanthaburi Thailand

Chanthaburi sapphire (Thailand)
Black star sapphires are found mainly at Bang Kha Cha and Khao Ploi Waen, Chanthaburi (approx. 152 miles east of Bangkok. From these mines, just a few miles from the GemsTV workshops, stunning blue, green and yellow sapphires are also unearthed. Displaying gorgeous golden hues, a stunning sapphire variety we aptly called “Chanthaburi sapphire” from a new alluvial pocket at Bang Kha Cha proved hugely popular in 2005.

Black star sapphires differ from other corundum in that their color is not due to trace elements or color centers. Instead, it is caused by the color of exsolved hematite-ilmenite silk inclusions. This silk imparts a deep brown black color to an otherwise blue, green or yellow sapphire. This is called mechanical coloration or “color by inclusions.” Not only are they responsible for color, but they also produce a six-rayed star effect. When it occurs in an otherwise blue or green sapphire, the rays of the star appear white. Sometimes the hematite unmixes in a yellow sapphire, giving the star a golden yellow color.

Today, mining in Chanthaburi is limited making top quality sapphires from this town exceedingly rare. In fact, we think what is being traded in the local market is predominately older stock, with very few new gems being unearthed.

4.65 Ct. Natural Cabochon Chanthaburi Sapphire Jewellery Supplies Gems From Thailand


  • Handmade Supply
  • Materials: natural gemstone, natural loose bead, yellow gemstone, loose gemstone, cabochon sapphire, cabochon, precious stone, chanthaburi sapphire, handcut cabochon, handcut sapphire
  • Ships worldwide from Thailand
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