Abstract: This invention provides a computer implemented method to identify a specific gemstone with a known reference point. In one embodiment, said computer implemented method, comprises the steps of: (a) detecting said known reference point from a source image of said specific gemstone; (b) Retrieving one or more reference images of possible gemstones from a gemstone database based on said known reference point; (c) extracting edge features from said source image and said one or more reference images; (d) computing a similarity value by matching said edge features from each of said one or more reference images against said source image; and (e) identifying said specific gemstone from said one or more reference images based on said similarity value.
Type:
Grant
Filed:
July 26, 2023
Date of Patent:
January 16, 2024
Assignee:
CHOW SANG SANG JEWELLERY COMPANY LIMITED
Inventors:
Shuk Kwan Mak, Wai Chiu Lam, Tat Ming Ng, Kwok Bun Cheng
Abstract: This invention provides a jewelry alloy which improves mechanical properties of AuIn2 while preserving its attractive blue hue. In one embodiment, said mechanical properties comprises fracture toughness and hardness. In one embodiment, said jewelry alloy consist essentially of 43.0 to 49.0 wt % Au; 51.0 to 57.0 wt % In; 0.001 to 1.0 wt % of one or more elements selected from the group consisting of Fe and Ge; and 0.001 to 1.0 wt % of one or more elements selected from the group consisting of Rh, Ir and Ru.
Type:
Grant
Filed:
July 22, 2021
Date of Patent:
March 8, 2022
Assignee:
CHOW SANG SANG JEWELLERY COMPANY LIMITED
Inventors:
Wai Kei Cheung, Shuk Kwan Mak, Mei Tsz Macy WONG
Abstract: This invention relates to a platinum electrodeposition bath which is capable of forming platinum deposits having an attractive shiny granular surface like a velvet, which is particularly useful in jewelry manufacturing. The velvet effect can be illustrated by comparing the surface roughness with a bright smooth platinum deposit.
Type:
Grant
Filed:
September 5, 2019
Date of Patent:
April 7, 2020
Assignee:
CHOW SANG SANG JEWELLERY COMPANY LIMITED