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home > Kosei | 4.05ct Quilpie Boulder Opal & Sapphire Pendant in 18k Gold > Kosei | 4.05ct Quilpie Boulder Opal & Sapphire Pendant in 18k Gold
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Kosei | 4.05ct Quilpie Boulder Opal & Sapphire Pendant in 18k GoldMeet Kosei, A Modernist Boulder Opal & Sapphire Pendant in 18k Gold Sleek, architectural, and undeniably uniquethis handcrafted 18k yellow gold pendant presents a 4. 05 carat Quilpie boulder opal, framed in a striking Japanese modernist design. The opals natural blue green fire plays subtly across its earthy ironstone matrix, creating an organic contrast against the pendants structured gold frame. Accented with 1. 01 carats of natural sapphires and
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Meet Kosei,

A Modernist Boulder Opal & Sapphire Pendant in 18k Gold

Sleek, architectural, and undeniably unique—this handcrafted 18k yellow gold pendant presents a 4.05-carat Quilpie boulder opal, framed in a striking Japanese modernist design. The opal’s natural blue-green fire plays subtly across its earthy ironstone matrix, creating an organic contrast against the pendant’s structured gold frame.

Accented with 1.01 carats of natural sapphires and diamonds, the composition evokes an effortless balance of elegance and contemporary artistry. The open-frame slider setting, imported from Japan, allows light to pass through the design, adding an airy sophistication to the pendant’s geometric aesthetic.

This piece comes with a Gem Grading System Japan (GGS) certificate, verifying its natural boulder opal (translated from 天然ボルダーオパール) and sapphire (脇石は天然サファイアと認む) accents. The pendant measures 1.2” long and is accompanied by an 18” gold-plated sterling silver box chain.

Designed for those who appreciate artistic, one-of-a-kind jewelry, this pendant embodies a refined, gallery-worthy aesthetic—perfect for the modern collector.

 

More Information...

The Showcase Stones: Natural Boulder Opal, solid

  • carat weight: 4.05cts (inscribed on back of pendant)
  • origin: Quilpie, Queensland, Australia
  • shape: polished freeform
  • stone measurements (millimeters): 14.22mm x 8.57mm
  • stone measurements (inches): 0.6" x 0.33"
  • body tone: N4
  • brightness of color play: 2.5 of 5
  • color play description: blue/green only

The Accent Stones: Sapphire, natural

  • stone count: 6
  • total carat weight: 1.01cts (inscribed on back of pendant)
  • cut: faceted rounds
  • color: 4 stones are blue, 2 stones are white

The Setting: Open-Rectangle Bezel-Set Slider Pendant, chain included

  • pendant metal: 18k yellow gold, solid
  • chain metal: .925 sterling silver, gold plated
  • pendant length: 30.39mm (1.2")
  • pendant width: 13.29mm (0.5")
  • bail opening width: 1.77mm
  • pendant weight: 4.69 grams (not including chain)

Kosei | 4.05ct Quilpie Boulder Opal & Sapphire Pendant in 18k Gold

Item no : 64415976837
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US$ 990.00
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Min. order: 1piece

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