4.10 Ct. Ametrine from Ceylon (Sri Lanka)

This transparent, bi color ametrine presented by The Natural Gemstone Company is a notable example of premium quality in a 4.10 carat size, cushion shape, measuring 11.78 by 9.88 by 6.29 millimeters. The 4.10 carat weight places this stone in a category that is immediately attractive to collectors and connoisseurs, because ametrine specimens of this size with clear, distinct bicolor zoning are uncommon on the market. The mixed brilliant cut used here has been executed to balance scintillation and color separation, allowing both the citrine golden tones and the amethyst violet tones to present with clarity and vibrancy. At medium light color intensity the two hues are gently balanced, providing versatility for jewelry design while preserving the gem’s natural character. This is a transparent stone with an excellent polish that enhances light return and surface brilliance, turning the 4.10 carat weight into visible presence on a ring or pendant without appearing bulky, which is an important consideration for an educated buyer assessing wearability and visual impact.

From a gemological perspective this ametrine carries attributes that underpin its premium positioning. The clarity grade is described as very very slightly included, evaluated at eye level, which for practical purposes means the gem is essentially eye clean under normal viewing conditions and only shows minor internal features under magnification or careful scrutiny. These minute inclusions do not detract from optical performance, and because they are minimal they often prove stable under cutting and setting, preserving the gem’s integrity. The mixed brilliant cut maximizes faceted brilliance while maintaining the soft cushion outline that flatters the gem’s color zoning. The excellent polish further contributes to strong surface luster and crisp facet junctions, important factors in both aesthetic appeal and measured brilliance. As a member of the quartz family, ametrine has a refractive index and durability profile consistent with everyday wear, and its hardness around Mohs 7 and specific gravity near 2.65 make it well suited to fine jewelry settings that protect the stone while showcasing the 4.10 carat size and striking bi-color effect.

The reported origin of this ametrine is Ceylon, Sri Lanka, and the stone has undergone heat treatment as an enhancement, details that matter to the careful buyer. While ametrine is most famously sourced from Bolivia, documented provenance from Sri Lanka is notable and may reflect different geological conditions that produced the observed color distribution, and The Natural Gemstone Company discloses this origin to support informed collecting and design decisions. Heat treatment is a common, stable enhancement in quartz varieties, used to fine tune color balance and reduce undesirable brownish or greenish overtones, and when performed correctly it is permanent and does not compromise the gem’s stability. For valuation and long term care, heat treated ametrine is regarded as market acceptable and retains strong appeal when other quality parameters are high, as they are here with a 4.10 carat weight, excellent polish, and very very slightly included clarity. For a buyer seeking a sizable, visually balanced, and technically well-executed ametrine, this stone represents a compelling combination of presence, optical quality, and transparent provenance, offered by The Natural Gemstone Company with full disclosure of enhancement and origin, making it suitable for investment quality jewelry or an elevated collector’s cabinet.