參考資料

參考資料 / Reference Guide

圓形鑽石尺寸與卡重參考表

Round Diamond Size & Carat Weight Chart

以下資料適用於比例正常的圓形明亮式鑽石，用作珠寶設計、選石及估算石重的參考。卡重是重量，毫米是外觀尺寸；實際重量會因切工比例、深度及腰圍厚度而有所不同。

The following figures are approximate references for well-proportioned round brilliant diamonds. Carat measures weight, while millimetres measure face-up size. Actual weight may vary according to cut proportions, depth and girdle thickness.

重要提示 / Important:
6.4–6.5 mm 圓鑽約等於 1.00 ct（1 卡）。
A 6.4–6.5 mm round brilliant diamond is approximately 1.00 ct.

碎鑽參考 / Melee Diamond Reference

直徑 Diameter	約重 Approx. Weight	每卡約有 Approx. Stones per Carat
0.8 mm	0.0025 ct	400
1.0 mm	0.005 ct	200
1.25 mm	0.01 ct	100
1.5 mm	0.015 ct	67
1.75 mm	0.02 ct	50
2.0 mm	0.03 ct	33
2.5 mm	0.06 ct	17
2.75 mm	0.08 ct	12.5
3.0 mm	0.10 ct	10
3.25 mm	0.13 ct	7.7
3.5 mm	0.17 ct	5.9
3.8 mm	0.20 ct	5

主石參考 / Centre Diamond Reference

直徑 Diameter	約重 Approx. Carat Weight
4.0–4.1 mm	0.25 ct
4.3 mm	0.30 ct
4.7–4.8 mm	0.40 ct
5.1–5.2 mm	0.50 ct
5.4 mm	0.60 ct
5.7 mm	0.70 ct
5.8 mm	0.75 ct
5.9 mm	0.80 ct
6.2 mm	0.90 ct
6.4–6.5 mm	1.00 ct
6.6 mm	1.10 ct
6.8 mm	1.20 ct
7.0 mm	1.30 ct
7.15 mm	1.40 ct
7.3–7.4 mm	1.50 ct
7.7 mm	1.75 ct
8.0–8.1 mm	2.00 ct
8.5 mm	2.25 ct
8.8–8.9 mm	2.50 ct
9.0 mm	2.75 ct
9.2–9.3 mm	3.00 ct
10.1–10.2 mm	4.00 ct
11.0 mm	5.00 ct

重量單位 / Weight Units

1 卡（ct）＝ 100 分（points）＝ 0.2 克（g）
0.50 ct ＝ 50 分；0.25 ct ＝ 25 分；0.01 ct ＝ 1 分
1 carat (ct) = 100 points = 0.2 gram (g)

估算公式 / Estimation Formula

如已知圓鑽的平均直徑及深度，可使用以下公式估算重量：
估計卡重＝平均直徑² × 深度 × 0.0061

If the average diameter and depth are known, the approximate weight of a round brilliant diamond can be estimated as:
Estimated carat weight = Average diameter² × Depth × 0.0061

本表只供一般參考，不能代替實際磅重或鑑定證書。天然鑽石與培育鑽石密度相同，可使用相同參考；莫桑石及其他寶石的密度不同，不適用本表。
This chart is for general reference only and does not replace actual weighing or a grading report. Natural and laboratory-grown diamonds have the same density and may use the same reference. Moissanite and other gemstones have different densities and are not covered by this chart.

物流及運費參考 / Shipping Reference

適用貨品 / Applicable items
18K 金半成品 / 商業樣辦，50g 以下
18K gold semi-finished products / commercial samples, under 50g

參考運費 / Reference shipping fee
香港寄澳洲約 HK$150-HK$250 起
From Hong Kong to Australia, approximately HK$150-HK$250 and up

參考時效 / Estimated delivery time
約 4-7 個工作日，視乎目的地及清關情況
Around 4-7 business days, depending on destination and customs clearance

參考案例 / Reference case
過往曾成功安排 18K 金半成品由香港寄往澳洲，約 4 個工作日送達
We have previously arranged shipment of 18K gold semi-finished products from Hong Kong to Australia, delivered in around 4 business days

免責聲明 / Disclaimer

以上資料根據過往寄件案例及第三方物流平台參考整理，只供客戶估算。實際運費、時效、清關、保險及是否可承運，均以物流公司最終確認為準。

The above information is based on previous shipment cases and third-party logistics platform references, and is provided for estimation purposes only. Actual shipping fees, delivery time, customs clearance, insurance coverage, and shipment acceptance are subject to final confirmation by the logistics provider.

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