4.30 Ct.Tw.Total Carat Weight Cabochon Opal Pair from Australia

We at The Natural Gemstone Company are pleased to present a finely matched pair of translucent pear shape multi color opals, offered as a coordinated set ideal for high quality jewelry applications. The pair weighs 1.99 carats and 2.31 carats respectively, with dimensions of 17.50 x 7.64 x 2.18 millimeters for the smaller stone, and 17.57 x 7.65 x 2.59 millimeters for the larger stone. Both stones are cabochon cut, which is the traditional and preferred cut for opal because it enhances the play of color. These are classified as Semi Black Opal, originating from Australia, with an excellent polish, intense color intensity, and a clarity grade evaluated as very slightly included at eye level. There has been no enhancement applied to these gems, and their natural condition is a key attribute for collectors and discerning buyers who prioritize untreated material.

From a gemological perspective, these opals exemplify the reasons that Semi Black Opal occupies a special place in the market. Opal is a hydrated amorphous form of silica, and the optical phenomenon known as play of color arises from the diffraction of light by the ordered silica spheres within the stone. The Semi Black classification refers to a darker body tone than common white opal, while not being as deep as true black opal. This intermediate body tone tends to increase the perceived saturation and contrast of the play of color, which is why intense color intensity in a Semi Black Opal is particularly desirable. In these examples, the cabochon dome has been shaped and polished to maximize the visibility of vibrant flashes, primarily in the green to blue range, which appear strongly against the translucent background. The excellent polish contributes to clean light return and sharp color patches, and the pear shape provides graceful lines that are often sought after for matched earring designs or an elegant pendant pair.

Clarity and finish are important factors when assessing opal value, and the clarity grade of very slightly included evaluated at eye level describes a stone with minimal natural features that do not distract from the visual performance. In opal grading, inclusions often take the form of tiny fissures, potch areas, or mineral inclusions, and when they are subtle they have little impact on durability or aesthetic appeal. Because these opals are translucent with strong internal color, the few very slight inclusions are largely inconsequential to the overall effect seen by the unaided eye. The cabochon cut and thickness are balanced to reveal broad color patches without excessive curvature that can fragment pattern. The matching dimensions and near identical lengths and widths indicate careful selection and cutting, making the pair particularly suitable for jewelry where symmetry and continuity of appearance are important. The fact that no enhancement has been applied is significant to an educated buyer, because treated opals can be more common and can carry different long term care considerations.

Provenance and treatment disclosure are essential for valuation and long term confidence in the gem. Australian origin is widely respected in the opal market, as Australia supplies the majority of the world s finest opal material and has established mining and cutting traditions that support consistent quality. The absence of enhancement means these stones are stable in their natural state, and they communicate a clear story of origin and craftsmanship. For jewelry design, the pair works extremely well for matched drop earrings or as a paired pendant arrangement, and the pear shape lends itself to both vertical and horizontal settings. Because opal is softer than many gemstones, we recommend protective settings such as bezel mounts for high wear pieces, or secure prongs with appropriate metal guards for dangling styles to reduce impact and edge stress. Care recommendations include avoiding exposure to harsh chemicals and extreme temperature fluctuations, cleaning with mild soapy water and a soft cloth, and periodic inspection of the setting to ensure the cabochons remain secure.

As representatives of The Natural Gemstone Company we can assist with documentation, additional photographs under varied lighting conditions, and guidance on setting options that will best showcase the intense play of color inherent in these Semi Black Opal cabochons. For collectors and jewellers alike, the combination of near matched size and shape, Australian origin, unenhanced status, and excellent polish makes this pair an attractive acquisition. They offer strong potential both as a design focal point in fine jewelry and as a natural gem investment where provenance and optical performance are prioritized. If you would like more information about matching settings, appraisal documentation, or bespoke mounting services, we are available to consult and provide the additional images or technical details you require, and we welcome the opportunity to present these opals in person or through our secure sales channels.